Originally Posted by
mrblue
Interesting that you mention some are held on with double-sided tape. That seems so...not secure. I mean, what if the tape gets wet?
In practice they tend to be kept in place pretty well just by cable tension - I had one that was pop-riveted in place on one of my bikes, and I drilled the rivet out because it got in the way when I tried to fit a cartridge BB. I was planning to tap the hole and use a screw, but I realised recently that I never got around to it, and the guide's still there.