If you have a 3d printer and some 1st surface mirrors. I had a similar problem with a couple of projectors I was converting from Green DPSS to RGB and discovered that the laser output aperture was offset. The solution I arrived at after trying a shim for the scanners (again a potential heat dissipation issue) was to create a periscope for the laser to lower the beam. I forget what the distance is however it is the distance between the center axes of the scanners. If you rotated the scanners so that the laser was pointed at the other scanner everything lined up however the project wasn't constructed that way.

Here is a picture of the periscope in the projector:

Click image for larger version. 

Name:	laser_periscope.jpg 
Views:	10 
Size:	497.5 KB 
ID:	58114

Here is the periscope STL file:

http://www.fab-favreau.com/downloads...irector_V5.stl

I cut some mirrors to fit and used a 6-32 machine screw to adjust the top mirror to make small adjustments in the vertical angle of the laser.

If you want to use it and need it redesigned to fit your laser and scanners please let me know. I have the cad file for it and can adjust it if you would like.