bobble heads

[Wimblees@aol.com]

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Problem: Bobbling hammers on a S&S M from C5 on down. I mean, they don't even 
check on a hard blow.  Some of them are checking, but only on a hard blow. 
The rest just bobble. New hammers, shanks and flanges. 

Let off is right, drop is right, there is after touch. I changed let off, I 
changed drop.  Keys are level, right amount of dip.  I increased dip, 
decreased dip. I've increased rep spring, and decreased rep spring. Dampers 
are not in the way. Nothing. 

This is a 1939 model. There has been some discussion about knuckle size.  As 
I said, these are relatively, (about 3 years old) new h/s/f/ , with 3/8" 
knuckles. Could that have an effect?

Wim 

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