I have a set of clamps that I bought at Menards on sale:
http://www.menards.com/main/tools-ha...70320164051319
I really try to look over my quilt before I take it off the frame, but sometimes I see something that I missed or really, really needs to be taken out & redone. I pin it to the top roller, roll it to the appropriate spot, then just use the clamps and some batting to hold it onto the other rail. Sometimes I can just clamp it to both rails. Depends where the problem area is.