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Author Message   Scanogram Tinkerer Username: Scanogram Post Number: 9 Registered: 04-2008 Rating: N/A Votes: 0 Posted on Wednesday, June 18, 2008 - 02:48 pm:    Yes it's there for a reason. It keeps the lens snug against the mount and keeps the proper distance between the lens and film plane. Allows the diaphragm lever to operate and control info to transfer properly. If your lenses are too tight, a very small amount of grease would be ok on the spring.