Posted by My sentiments... on December 03, 2003 at 18:20:36:
In Reply to: Re: Re: Valve Buttons posted by huh? on December 03, 2003 at 17:00:08:
... exactly. I have about 30 years in as a machine designer and have NEVER had a call to use a 6-40 thread.... ALWAYS a #6-32.... until I changed fields, purchased a bunch equipment and set up my own brass repair shop. There are really some strange fasteners on musical instruments.