I just attached a new 127mm 3.8 I just got onto my RZ, and after shooting a test roll the lens seems to be stuck. The lock ring will not budge, when putting it on it went on straight, so I don't think it's the threads that are skewed. After researching a little I found out about the paperclip trick but all the info I've found on it seems to be for the RB. Any ideas about how I can get this off without risking something getting damaged? It'd be much appreciated!