MFB Question

[Deadbolt47A]

I have a question. The two clamping holes for the over arm support in my mfb's headstock a are threaded. Are all the headstocks like this or did someone do this at home? Thanks.

 

[wa5cab]

No, the holes should both be smooth bore. In each hole should be one M6-44 Lock, One M1-26 Rubber Spacer, two M6-45 Lock Sleeves and one 1/4"-20 x 2-1/2" square head bolt with threaded end out. Screwed onto the bolt should be an M1-47 Lock Handle.