My Bintel laser collimator doesn't show this problem. It was slightly out of collimation, but tweaked up easily - when 1) I finally found the right hex key at the bottom of one of my toolboxes, and 2) managed to get the batteries out and replace with fresh set. The last battery was jammed in place - I had to drill a hole in it, insert a screw and pull.
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I've paid no particular attention to how far I've screwed the on/off screw in, but on checking the laser's collimation recently, it was still spot on. My 8" has been a dream to collimate with the laser, particularly after I pulled out those Phillips head tilt screws on the secondary and replaced them with "Eric's Secondary Tilt Knobs"! Rough prototype at present - I'll polish them up soon - get the edges out of the light path
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The problem I have is that the laser throws a "sausage" image through the Barlow, so won't cover the primary centre spot well enough to use the "barlowed laser" technique. It's not the Barlow lens - I can shine my green laser through it and get a nice big diffuse circle of light. I'm stumped - maybe need to fit a different cheapie red laser - after I check that it shows a good diffuse circle through the Barlow.
