If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
>If your 50 mm 1.8 f-stop ring doesn't have detents (clicks) it is not >working right. It is possible to open the front of the lens and clean out >the hardened grease and replace it with new grease so the little ball >bearing works correctly. Be very careful and work over a cookie pan so >you don't lose the spring or bearing.
There is more to this and the complete directions should be available on the web.