BRBS Beaudry repair parts are pieces I've had to make 
to replace the missing "crank shaft"... the shaft that 
lifts and throws the hammer arm.  I found the brass 
sleeve on ebay, so machined the parts to fit, as it 
would have cost me more to make than it sold for.

The nut was machined from the only round piece I had 
laying around that was big enough.  The other parts 
are all from a 4.5" bar I bought.  It is supposed to 
be 1018, but might be 3140.  No one was sure and the 
paint labeling was ambiguous.

This is the first time I've done any significant boring, 
and the first time I ever did internal threads.  They are 
5 tpi on 2", and the shaft is 2.5".  The ruler in the 
pictures is a standard 6" machinist rule for scale.