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Are Trackballs supposed to jump?

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Hoagie_one:
bought a used trackball off ebay and its a little dusty but looks good, rolls good.  Granted I havent took it apart yet.  But when I give it a thumb snap (Snap teh ball fast), it jumps up a little.  I gotta think that any jump means it's not rolling and thus not sending a signal.  Is this normal or do i have to replace some rollers ofr somthing?

Its a 3" imperial BTW

cholin:
Backspin maybe?  I dont have a trackball, but lots of people have these problems due to sensitivity.

paigeoliver:
It probably has dirt or something built up on the rollers.

Hoagie_one:
let me rephrase my question.  Am I supposed to be able to lift the ball off the rollers slightly?

IMMark:
mine does not lift up at all.

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