Did not like the idea of another lens in the path of the laser. Not to mention the cost of said lens and another mount.
So I thought I would give this method a go. I saw this idea somewhere and am not claiming it as mine.
The laser pointer drops into the laser path when the lid is open. Then lifts out of the way when the lid is shut.
Once the mirrors are adjusted for the primary laser, obviously you don't want to move them. So the only way to make the dot concentric is to do all the adjustment at the small laser module.
Made a mount with adjustment in every possible plane.
Works great. It is hard to photograph with a flash but the dot is clear and sharp.
When the lid is open then the red dot module drops into place.
And when the lid closes the red dot module lifts clear of the main laser path.