and here it is ...
the the green laser is fixed and no adjustment is made at anypoint of the beam
the red lasers nearfeld adjustment is done on the first mirror
this makes sure that the green and red are perfectly overlaid it the point of origin, the farfeild adjustment is done on the dichro this makes sure that the both beams are perfectly overlaid over a distance ( say 50 metres )
this is repeated with the blue
and it takes just seconds to get perfect aignment
the red and the blue beams are not reflected at perfect rightangles,
i found that this was the optimum position with the less loss through the dicros
hope this helps ...... Karl