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It is easy to open up the hand controller and clean all the contacts for the buttons. It won't leave any signs of being tampered with if you should
have to send it back under warranty. Can you feel any backlash in either
axis when you try to move it manually? If you have noticeable backlash
you can minimise it by doing the appropriate adjustments. Astrobaby
can be googled for video tutorials on how to do it.
raymo
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