I've got quite a problem going on here. I bought a bike off eBay a couple weeks ago and have been fixing things with it ever since. The seller said he would no longer pay for any more work to be done. Initially I took it to two shops and they both said that the BB was installed incorrectly or not adjusted. One wanted about $80 to fix it, and one wanted $25. I took it to the one that wanted $25. The one that wanted $80 said you have to lever the drive side cup in when installing it. The other shop looked at me like I had 3 heads when I told them this. I can't find any evidence of it online.
Fast forward to yesterday, I get the bike back from the shop. I'm in the process of adjusting the FD and I notice that the chainring isn't parallel to the FD cage at all points. It moves in and out. This signifies either a badly installed BB, bent spider, or bent chainring. I took it back to the first shop on recommendation of a friend in the cycling club who used to be a mechanic there. The guy he recommended was the same one as before, and again said that there was play in the BB and it needed to be reinstalled and levered in. He again wanted $80 to do the work. He says he can feel play in the BB, but neither myself nor the guy at the second shop (who's been a mechanic for 14 years) can feel it.
The problem is that I've already had this work done once, and if something is wrong I should take it back to them. But if I take it back to them, they aren't going to believe me and are going to say that everything is just fine.
I still don't know what is bent, or how big of a deal it is. It looks to me like the outer chainring is bent, but the guy at the shop wouldn't even check because he's so convinced that there is a problem with the BB.
Please help, I have no idea what to do here...