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Hi,
Before you cut, take the focuser off, take the diagonal off the focuser and with an eyepiece in the diagonal lay the telescope down on a board, hold the diagonal and see if you can focus on some item on the horizon. If you can, mark the diagonal position and the tube position and see how much you need to cut to fit in with the focuser racked in. You can add a couple of millimeters remembering that you can always rack out to compensate. Remember that the mark you have made will indicate the maximum inward position of the focuser.
Before you cut, consider which end you wish to cut taking into account possible loss of threads.
Take your time, think and good luck
Chris
Cape Town
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