Having a strange problem removing my chain ring bolt. problem is there is nothing to hold the back piece with because its perfectly rounded/flat, so when i turn the front the whole piece rotates. what do i do ?? All the ones ive seen have a slot so u can use a tool to hold it in place but mine doesnt. Thank you so much in advance.
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The crankset you have is actually held together with rivets and not bolts. Some manufacturers of some low-end cranksets make the rivets with a hex head on one side. The easiest way to remove it is with a hex key and a drill. Select a drill bit that is slightly larger than the core of the rivet. Being sure to hold it steady with a hex key, drill enough material out of the back side of the rivet and it should come right out. Replace with a normal chain ring bolt and you're done.
(This is the easy way to remove most rivets. If you're working on a blind rivet - when you can't see the back side - start drilling at an angle. The trick is to mutilate the rivet but not the hole!)