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Never had a problem with extensions on mine Niko. Runs OK on USB 1.1 or 2.0 without powered hub. Have you anything else running off the USB sockets ? Could be getting close to the power limit from the USB. Try it with a hub if this is so.
Re Cutting the end off the aGent. The best way I've found is to take the whole inner casing out and remove the screws holding the lens focuser. (No problems with swarf and less chance of cracking the circuit board) You can also cut back the inner casing 4-5 mm so when you put it back into the tube its end sits that far down the SS tube. This gives somewhere to mount an IR filter and a thread to screw extra ones on.
Have fun guys
Bill
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