I'm not much of a mechanic, but I've been trying to do all my own wrenching for about two years now. I still drop by the LBS every now and then on things I've not yet learned. I started a new build partly as continuing education and partly to get exactly what I wanted.
The build of a Surly Crosscheck frame with SRAM Rival groupo is complete, but I have a bit of a problem. The frame has no braze-on for the front der and the 31.8 Rival clamp is a bit big for the frame. So, I had to use a rubber shim. However, the tension from the cable pulls the der down off of the shim.
Is there a trick to getting this to stay or is it simply a matter of tightening it down enough?