Want to help a friend out with putting up a proper hook for his bike. He's got one of the standard budget hooks from a hardware store--the large, rubber-laminated c-hook with threading on the end. Before I chew up his plaster wall with my drill, I thought I'd check here to see if these are good enough for wall-hanging a bike (NOT ceiling). Do these thing bend if weight is put on them laterally? I realize attaching them to a 2x4 can be better, but can I get away with doing it straight into the wall? Anyone done this with or without problems?