I just received a Deardorff 8x10 I had purchased on eBay. Everything else looks fine, but there is about 0.5mm of play on one corner of the back. If you rotate it, the play is from the same corner (i.e. the camera body is fine.) Since the inside looks undisturbed, I am assuming that the back has warped slightly. Do I have to replace the back, or can I try to tighten up on the clips which hold it in place (they are otherwise firm) or try to nail in a new retaining pin just behind the existing one? (I am afraid of splitting the wood, however.) Does anyone have some easy fix for a problem like this?