I purchased a pack of #7 o-rings (1/2’ OD x 3/8’ ID) in the plumbing section at Home Depot and one o-ring allows the lens to snug up perfectly to the laser tube.
I purchased a pack of #7 o-rings (1/2’ OD x 3/8’ ID) in the plumbing section at Home Depot and one o-ring allows the lens to snug up perfectly to the laser tube.