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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 322 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, July 15, 2007 - 02:21 pm:    Most of the balls I have encountered in camera applications have been 1.0mm diameter (3/64 probably close enough in most cases), with some 1.5mm (very close to 1/16). I've looked at ink pen balls once or twice, but the ones that I have looked at have been much smaller. I went ahead and bought a supply from micro-tools - their prices I'm sure were higher than 4 cents apiece, but I'm also pretty sure that 250 of these would amount to MANY lifetimes' supply. The dozen or two that I got will last me forever I'm sure.