Sounds like you have it figured out. Lucked out on the set screw...I had to drill mine out and retap it. I have a Howse with a similar set up but it has three clutch discs and not two. They are about 1/8 inch thick or so when new. I found some on the web for about $8 a piece...others run about 12-18. You have to know the inside and outside diameter, obviously. When I put mine back together I gave it a good tightening up with a punch and hammer and then tightened it again after the day's use and it tightened up some more. You are compressing some dish looking "springs" that are pretty stout.