I have a 15" Wolly Tele-Optar which I disassembled to clean. I pulled the front ring and lifted out the front lens elements and cleaned everything from there. When I went to put the front back in, it tilted slightly and is now wedged in there tight, but not fully seated. I'm afraid that if I poke at it, it'll chip on the edges. Any thoughts on how to get it to either seat or pull it back out the front?