Re: HELP with SPROCKET bolts and brake arm at hub
Best fix is to not use coaster brake rims. Freewheel rims last longer and are MUCH easier to assemble. Simply add hand brake.
And easy fix for exhaust woes is drilling out flange holes. This allows pipe to turn for clearance. I have never yet had to bend an exhaust with this trick
If more is better, then too much is just enough.
If you can't afford it, build it yourself.