Well, after much (and I mean MUCH) suffering trying to fix this laser, I am happy to say I did it!
Sheesh, what a pain that was! But it is dead on straight with zero shift at 22 feet distance. Yeehaw! For any that don't remember the other thread for didn't read it, I bought a 'budget' laser years ago, it was made of one piece plastic. (not quite as cheesy as it sounds but not 'good' either). After reading Floyds article on collimatin a laser the fun began!What I ended up doing (going through)
I ground down the plastic barrel that inserts into the focuser, it came out crooked, ugh. So I finally got smart and took the laser out of the assembly leaving it empty. I put a drill bit on the drill, chosen to fit snug in the bottom hole and used the collimation bolts of the laser unit to grip the the drill bit. I then turned on the drill and watched for wobble, and used those bolts to align the assemble so it spun evenly. Now I had basically a lathe. So I put a razor blade in the vise and carefully ground the bottom of the laser as true as I could. Then I used an eyepeice barrel from an extra old Plossl and put that over the bottom, aligned it and glued it. Now I had a laser with a nice metal ROUND barrel. Yay! I re-inserted the laser unit and began the collimation of the laser process. Collimation
Here is where things got fun and where I thought I was going to do something even better than what Floyd suggested. He says to use a V-block, I thought "V-block, that doesn't sound good, I'll use the barrel of my barlow lense, or the 1.25 adapter ring from the focuser".
Oh no, that is NOT good, that little bit of play in those (even though I swore I had none) messed me up like you wouldn't beleive. Last night I made a V-block, for my last try at aligning it. And "Lo and Behold" it worked perfectly. It was so easy to rotate and keep it stable. (Maybe Floyd should edit his article for people like me and say, "USE a V-Block DO NOT try using your barlow or adapter ring!!!!"
) End product
Now it's dead on perfect as can be.
I had bought a cheshire this week also, and man, I cannot see HOW you can get the secondary pointing at the primary center as accurately with that, as you can with a laser. I stare and look, it looks good, but I can twist one of the secondary screws a bit and things still look right.... or do they... hmmm, argh! I think I will do what someone else suggested on here and that's use the laser to adjust the secondary and the cheshire to adjust the primary.
Whew, what fun this was!