Originally Posted by
dsbrantjr
Don't skimp on the fastener length; screws can be easily shortened for a just-right fit. Ideally at least one full thread should protrude from the nut/eyelet.
+1 But be sure the lower bolt on the drive side doesn't protrude so far inside the dropout that it interferes with the chain shifting to or running on the smallest cog. The cog to dropout clearances can be pretty tight.