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GGG Trackball not moving/spinning
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BobA:
I think you should loosen up on the screws.   Rubber or nylon washers  are a  good idea and if you are worried about the screws coming loose you can use a drop of locktite on the end of the screw that goes into the mounting plate.
mordelack:
TopJimmy you might be onto something.  Fitting the trackball in the routed whole is an extremely tight fit.  No wiggle room at all.  Maybe that is part of what is contorting the chassis.

For the trackball to really roll the bolts have to be almost completely un-done.
TopJimmyCooks:
definitely make sure no wood is touching the sides of the trackball housing under the panel.  you can carve it out a little with a chisel or utility knife. 
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