Help - Meade LightBridge truss-dobsonians mirror alignment

[styoda]

Hi,

I have bought a second hand 10" LightBridge truss-dobsonians and having trouble getting it aligned.

I think the previous owner made a mess of things trying to align it and the diagonal mirror has been moved.

I have the laser collimator but this doesn’t seem to help and not sure how to get the diagonal mirror square.

Has anyone got any advice on how to align these telescopes in the easiest possible way?

Thanks in advance,

Scott

[haitch]

I would suggest a Cheshire to square up the secondary first and don't assume the spot on the primary is in the centre. Look up Astrobaby's guide on here.