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If you have a 75mm focuser and a simple doublet or perhaps a triplet and can make a plate which screws into the focuser with a small hole in the centre with three equally spaced leds on the back as far apart as practical, that can work. That is what I used.
Will only work with a big 75 mm focuser other wise the reflected separation is too small to see without adding the collimating scope lenses as Tak and Grzybowski do. Stefan could make them easily and you could all buy one.
We could call it the Buda collimator.
I only added the t2 lense and projection reticle spacer in a 2inch eyepiece clamp to confirm the result by taking the photos.
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