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After dropping onto a concrete floor, mine lost collimation. Fortunatley, I have a metalwork lathe. If you can access one re-alignment is relatively simple.
Place the collimator into the lathe chuck so that the light beam shoots through the chuck, back through the gear end of the lathe, not out toward the tailstock end. (This allows you access to the adjustment screws and holds the collimator as it would be held in the telescope.)
I placed a piece of cardboard as far away as my lathe as the workshop would allow, and traced the circle the beam made as I rotated the head by hand. The central point is then fairly easy to locate. Make a dot in the centre. Adjust the colimator screws to bring the trace onto the centre dot.
Re-check by rotating the head again and repeating any fine adjustment if neccessary, until you are happy with it.
HTH,
BC
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