I would say that refractor tube assemblies are perhaps the easiest for an ATM'er to build themselves. Aluminum irrigation pipe seems to come in most diameters and is pretty easy to cut, I've done it with a hack saw and a file to square it.
I have some extra pieces for a 5" and 6" refractor if any wants some. BTW, I think one of most impressive 4" refractors I have seen was a Unitron. I want to apologize to Debbie, and the list members at large, as my
reply was made in haste and is obviously confrontational, read in retrospect.
I have purchased 2 WO accessories (neither was an optical tube). One, bought several years ago, was impeccable, the other, purchased more recently, had obvious manufacturing flaws. I returned it to the seller for a full refund, was not interested in an exchange. I have also heard from others of a slip in WO quality recently, one is a U-A list member who can post or remain silent as they see fit.
Every manufacturer has items that slip past QA on occassion, but when it happens to a manufacturer of high repute, it leaves a very bad taste in the mouth, sometimes for a long time.
One man's meat is another man's poison, as they say.
YMMV.
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