I'm looking for screws per the attached photo. The larger diameter
thread is right-hand and 12-24. The small end is a left-hand thread
and I believe 8-24. Although it doesn't show in the photo, it is
a slotted screw. This is for a Kranich & Bach player action, a.k.a.
"The Player Action From Hell"!

Might screws like this have been used on other player actions or
possibly in some piano actions?

Thanks,

Dave Krall
Hammond, Indiana

P.S. I am in need of a short piece (15 inches) of thin wall rubber
tubing to fit a 9/16" O.D. elbow.

[ https://www.mmdigest.com/Attachments/25/04/02/250402_104517_100_4865.JPG