squairt some de greaser in it to clean it out and then squirt some WD40 in it and it should work fine it happened to me, or if it isnt much you could be missing some bearings or da back is loose hope i helped tom
hi it done the same on my 2006 python, what you need to do is put you 2 snail cams in a vice together and file some notches in to them cos mine used to just slip off the screw if you no what i meen hope this helps tom