I can't remember the bolt size 5_8, 3_4, 7_8, or 1. Get on about 2 or 3 iches long. Put the bolt though a link on chain from the inside and put a nut on the bolt on the outside of the chain(finger tight). Roll the chain and the bolt head will let the chain jump the sprocket tooth. This way, you will not loose a bolt because the nut will not let you.