broken keys

[JIMRPT@AOL.COM]

Et Al;
 I have the action from an Adam Schaff grand in the shop for repair and 
regulation.
 One of the repair thingees is broken keys at the balance rail hole. In the 
past there have been ten broken keys repaired. The existing repairs appear to 
have been made quite some time ago and the piano has had no use for at least 
twenty years.  All of the existing repairs were made with 'double edged razor 
blades' broken in half and imbedded in 'hide glue' on each side of the key ! 
There is nothing covering the hide glue/keyside which appears to have been 
clamped with 'wax paper'. The repair is very neatly made.

 Question: Has anyone seen this particular type repair before ? I never had 
and I wonder if it was a method that was common in some areas. I have no idea 
where the piano originally came from.
Jim Bryant (FL)