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Author Message   Old_school Tinkerer Username: Old_school Post Number: 62 Registered: 04-2011 Rating: N/A Votes: 0 Posted on Friday, June 03, 2011 - 10:31 am:    I just tossed out an old computer diskette, but before it went took it apart. There is a nice spring in there for the sliding cover. It measures like 0.0135 inches or 0.34mm diameter & the arms are 14mm in length for instance. Ball point pens were a source for springs & the little ball at the end on the tip could be used some times for a detent for F stops or where ever needed. Post it when I think of it The Best Mike.....