How to regulate the Malvern

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Hans
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How to regulate the Malvern

Post by Hans »

Before I start explaining how I regulate my Malvern, lets make one thing clear: it is very easy to ruin your watch by simply opening it up if you are not very careful and have some basic understanding of watchmaking.
I am not a qualified watchmaker, just a simple guy who took a couple of watchmaking-classes on the internet (http://www.timezonewatchschool.com). If you don't feel absolutely comfortable with the procedure after reading my post, then simply go to a professional watchmaker, my watchmaker does it for free!

Well, here it goes then, first let me show you the instruments I use:

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Probably the most important tool is the screwdriver, you really need a good set! Each time you are using the screwdriver you should determine if it is the correct size for the screw; using a too small or too large screwdriver might damage the screw and other parts of the watch.

The tweezers are also essential for handling the small screws, the screws are so small that they are difficult to handle using your fingers.

With the plastic dust cover you can make sure that your parts will stay clean.

The loupe is used for detailed examination of the movement, and can help you controlling the unscrew-activity.

With the dust-blower you can easily remove dust from different parts.

Now is the time to make the strap loose so the back of the watch can be accessed:

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And as an optional step: removing the strap from the case. Not necessary for this procedure, but I always prefer to handle the case without strap when I work on a movement (notice the spring-bar tool for removing the strap):

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Before opening up the case, remove dust and other particles from the back of the case by blowing some air with the dust-blower:

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Now we can remove the screws from the back of the case. Use a screwdriver of the correct size, in my case the red screwdriver in the Bergeon screwdriver set. This might seem very easy, but should be practiced until screws can be removed without slipping, you definitely don't want scratches on the back. The way I hold the screwdriver is one of the two 'official' ways to handle a screwdriver when working on a watch. It is best to practice a bit on an old movement:

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After loosening each screw, carefully take it out with the pliers:

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And store the screw in the dust-cover:

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Every part of the watch that you are not working on is kept safe away from dust:

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Now the movement can be accessed easily, don't you love the nice finish of the ETA-movement:

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This is the target of our operation:

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At [1] we see the eccentric screw regulator, at [2] the Incabloc shock protection can be seen and at [3] we notice the stud carrier. Keep away from the stud carrier and the Incabloc protection, we will only be turning the screw regulator slightly.

With the correct screwdriver (the yellow bergeon in my case) slightly turn the eccentric screw, never turn it more then one mark, first evaluate the effect for an extended period of time before turning it further. If the watch is running fast, turn in the direction of the "-" symbol, if the watch is running slow, turn in the direction of the "+" symbol.

Image

After making the adjustment, perform the above actions in the reverse order to assemble the watch again. Before closing the cover you can slightly blow the movement free of dust, but be very careful, never blow with force on the balance-spring, that might destroy your watch!

Now you can use your watch again for a few days, and determine how it runs, if necessary you can make another correction after some time.

Remember, this is a very primitive way of regulating your watch: a watchmaker uses advanced measurement instruments that can make a detailed analysis of how your watch is running...
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Post by Bob Demers »

Hans, I did not see your post before I posted mine. Great explaination. Thanks.
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Post by Kostya »

Excellent post, Hans. Thanks!
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Post by MYND »

Thanx Hans, you're the best.
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Post by joerattz »

Great post and photos.
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Post by DavidM1 »

Fantastic post Hans!
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Post by casimir »

Which is the dimension of the red screwdriver to unscrew ?
1,2mm ?

And regulate the movement with the yellow screwdriver ?
0,8mm ?
It is a google translation… please excuse the errors of language… thank you...
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Hans
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Post by Hans »

Yes, that is correct casimir.
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Re: How to regulate the Malvern

Post by John »

After reading this i decide to regulate my C5.
It ran 10 seconds too fast over a day.
I regulated it in two steps in a week time.
Now it is running 2 seconds too fast in a day, i think that's great for an automatic.
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Re: How to regulate the Malvern

Post by Russ-Shettle »

Hans,

I'm experienced in regulating watches and I would like to adjust my new C5 but what about the warranty in relation to me making my own adjustment?

The watch I bought before this on, the company said I had to ship it back to them and they would in turn ship it back to Germany. The manufacturer will have to perform the regulation.

As an alternative suggestion, I asked if I could have a certified watch maker regulate it without voiding the warranty. They said no. So I got mad and I said, "screw that" and opened it up and adjusted it anyway. It's running better now and is just fine.

I don't want to jeopardize my C5 warranty but I do have the ability and the know-how to adjust it and I would like the permission to do so. What do you say?

Russ
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Re: How to regulate the Malvern

Post by Daz »

:)
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Re: How to regulate the Malvern

Post by Russ-Shettle »

Daz,

When did you get it? Mine C5 has gone up and down. First it was fast, then it slowed down, now it speeded back up again and has settled a while. It increased 15 seconds in about 10 days. Then it began to slow down. It slowed to -12 seconds in about a week. Then it settled and began to speed back up. Now it's at zero, can you believe it. It has settled for now and I'm waiting for another change. I'm woundering about the date disk since this up and down cycle took place in one months time. Why the date disk? Just theory: If the disk were dragging somewhere during the month it might explain it.
If yours is consistently changing in one direction, I would say make an adjustment. As for mine, I don't know. I'll have to keep monitoring and see if the change repeats itself. I'll let you know.

Russ
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Re: How to regulate the Malvern

Post by Daz »

:(
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Re: How to regulate the Malvern

Post by Russ-Shettle »

It will be interesting to see how it goes. I check mine against two sources, my cell phone and an on-line time keeper site. I'm expecting a speed up on mine here soon. I don't know why I think that. Strangely enough, this has been partly the fun of owning an automatic.

So you think I should test it sleeping on my right side one night and then my left side and then on my stomach and back. See if this changes anything. You're so smart! I wish I had though of this….

Russ
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