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Last time I tried this contraption, it was VERY hard to find and place the star at the input of the optical fibre..
So in order to align the mirror box (which goes to telescope), I made the artificial star with small red laser ($1 on ebay).
I removed original colimator lens, and replaced it with 45mm FL objective from old SMENA-8 camera.
Such optical system produces F~10 conical beam, visible in eyepiece when mirror is placed in the optical path.
Because the mirror box was made pretty precisely by a friend of mine decades ago, only a small mirror adjustment was necessary to bring the "star" image to the centre of cross hair (glass reticle from crappy "military" Russian plastic binoculars).
I will try this on some bright star on first occasion.
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