Using a level to align derailleur hanger.
I was having problems with hanging shifts, both upshifts and downshifts, with my Shimano 105 9 speed drivetrain. I had gone through everything else, cables, cassette, chain but it still wasn't shifting right. The only thing left to do was to align the derailer hangar, and I was just about to take it to the shop when an idea struck me. Since the hangar has to be in a plane that is parallel to the plane that the seat tube is in, all I have to do is use a spirit level to measure.
So I put the bike in the stand, put the spirit level on the seat tube and shimmed up the stand until the seat tube was vertical. Then I laid the spirit level on the derailer hangar, and sure enough, it had been pushed in. So I used my BFAW (big f@cking adjustable wrench) to grasp the derailer hangar and bend it out. Now it shifts perfectly, at least on the stand. Tomorrow I'll try it on the road.
Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1