Originally Posted by Campag4life

Likely undertorqued as mentioned. If you don't have a lot of experience wrenching...even if you do...I generally use a torque wrench on cranks...invest in a good 3/8" drive torque wrench. Doesn't have to be high end wrench like Snapon...Craftsman will suffice. Also good to own a set of socket allens....hex allens bits attached to socket which plug into a torque wrench. Sometimes torque target isn't achievable with L shaped allen. When it comes to dual pinch bolts...torque in thirds...set torque wrench 1/3, 2/3 and full torque spec and alternate bolts for uniform clamping. Torque specs are generally found on the web...most crank makers have service manual PDF's on line. I always use a dap of grease on the spline to prevent bonding. Inspite of lubrication, this actually helps clamping...grease is captured in micro-voids between male and female splines.