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I purchased an FSA Carbon Pro Team Issue crankset about 3 years ago. It came with two sets of crankarm bolts: alloy and steel (cromoly?). The instructions were to torque down the crankset with the steel bolts, then remove them and install the alloy bolts, presumably for weight savings. However, I found the cranks would loosen up with the alloy bolts.

Eventually, I just put the steel bolts in, re-tightened the cranks, and left the steel bolts in. A few dozen grams of weight-savings isn't a big deal for me.
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