i might be using a few incorrect terms here...but you'll know what i am refering to. the small bolt that attaches the chain wheel to the crank arm is what i am wondering about. i haven't dealt with this set-up since probably the 80's...at that time i was too young to have worked on things so basically i never dealt with them.
question is this:
1) seems kind of like a delicate design...are there ever problems? does the bolt ever shear off?
2) does backward pedal/crank pressure cause fore and aft movement in the chain wheel slot?? it just doesn't look secure to me...or maybe only secure in the forward direction because the hole looks significantly larger than the bolt.