Logitech do some rather neat optical trackballs, called "Marble", with a speckledy ball to give the optical sensor something to work on.
Unfortunately they are all very decidedly asymmetrical and right-handed only. I have a Trust Ami Track trackball, which is sensibly designed: it is bilaterally symmetrical and equally suitable for right- or left-handed use. Unfortunately it uses mechanical pickup, with the attendant disadvantage of picking up finger grease which causes it to stop working. So I've whacked an optical sensor in it, and speckled the ball by hand with a felt pen. This took ages, and sooner or later I'm afraid the speckles are going to wear off. No doubt the Logitech speckled balls are more durably marked, so it would be worth my while to get a Logitech optical trackball just for the ball, as long as it's the right size. If anyone on the list has one of the Logitech devices, could you please measure the diameter of the ball and let me know? Please be as accurate as you can. The Trust needs a 40mm diameter ball; the tolerance is something around +/-0.5mm. TIA, -- Pigeon Be kind to pigeons Get my GPG key here: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x21C61F7F
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