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Cementing a Roller Jewel

From The American Horologist magazine, May 1940

Cementing a Roller Jewel 
By JOHN KRUSE 


1. To begin with, one should have a proper tool to hold a balance wheel in such a manner that it can be heated and yet will be protected against over heating.

2. Select the roller jewel which will fit the pallet fork loosely.

3. Clean roller table thoroughly of all possible grease and old cement. 

4. Place balance wheel with roller table attached in holder and heat it until shellac will melt freely when applied to roller table.

5. Place a small amount of shellac over the hole in roller table and insert roller jewel while shellac is still soft so that when finished, roller jewel will be set in parallel with the balance staff.
This has been my method of cementing roller jewels for the past thirty years.



At that time, not being able to find a suitable tool, I began to make one up myself and since then have improved it to the extent where one can cement jewels in large balance wheels as well as in small ones and also cement pallet jewels very conveniently. 



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