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IHC Member 1016 |
I have just attempted to replace a broken regulator spring off of a 990, with a spring from a 974. They looked the same, but when I removed them to make the exchange there is a problem. As you can see the one on the left is the broken one and there is a small hole next to the screw hole that a little pin from the regulator cock goes into to help hold it in place. The one on the right has a little pin to apparently fit into a hole that is being occupied by a little pin. My question: Are there two different regulator spring designs, or, is the pin stuck in the hole? If there are two designs where could one be found? | ||
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IHC President Life Member ![]() |
Hi Mike, The locating or alignment pin is missing from the broken regulator spring on the lower left. It is important to recognize there are differences in fit and finish between different 16-size Hamilton Regulator Springs or "Whip-springs" but all should have the locating pin, it should not be in the balance bridge. Remove the pin from the balance bridge and you should be all set. Lindell ![]() | |||
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IHC Life Member![]() |
And save the pin and the "old" regulator screw! | |||
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IHC Member 1016 |
Thanks, that is the information I needed, but how does one remove the locator pin without damaging the balance bridge? Very small needlenose pliers? | |||
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IHC President Life Member ![]() |
I agree with David about keeping material, we throw nothing away, someone out there needs that part! I would put a drop of penetrating fluid on it overnight and then remove it with a small pair of needle-nose as you suggested. Let's see if there are any other ideas! ![]() | |||
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IHC Life Member |
If you have an ultrasonic cleaner it might help to loosen the pin. | |||
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IHC Member 1016 |
I used a tweezer and some fluid and it eventually rocked out. As for the tiny extra screw, well, it's somewhere! ![]() I got my $12 worth today! | |||
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Railway Historian IHC Life Member Site Moderator ![]() |
I would tighten a pin vice around the pin, or better yet a wire chuck of the proper size in the headstock of a watchmakers lathe, and while holding the headstock slowly move the balance cock back and forth and gradually pull out the pin. Larry | |||
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Mike, Try and find that screw. You'll be needing one someday. | |||
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IHC Member 1016 |
Actually I did find it later. And I saved it. They really are small and hard to work with. The watch looks much nicer with the regulator spring correctly installed and unbroken. | |||
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