Hi Pat, I hear your frustration .
I had and loved a beautiful Takahashi M210 ( but hate diffraction spikes , being a refractor man ) that was a pain to get the last 1% of columation and you knew it was just not quite right , the Japanese state and show well in the manual how to use a high power star image ( 500x plus) to acheave that final 1% , anyway mate I got it after many attempts and WOAW!! you knew , the images were like a 7 inch + APO , so good , I did not think a reflector was capable of such views ,, awesome optics , but I digress .
So after getting my M210 perfect ( by myself ) and it held it for over a year of transporting out to our dark sky site in Darwin then a fellow observer got one of these and we had a play with it on several Newt's and it worked extremely well , I was impressed with the ease it showed mis-columation in the newt's , and made it easy to remedy , great bit of kit
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So I suggested we try it on my Tak thinking it was still a tad out and it will perform even better after this
,,, BIG!! mistake mate ! it showed the DK to be out of alignment by a smidge so we adjusted it to what the Hotech said and I did a quick look at Jupiter ,, what an abortion it was ,, like a vale had been put over the eyepiece ,, awful compared to what I knew this scope could do .
My thoughts Pat , don't use this on a compound scope , they certainly don't work on DK cassigrain's , probably SC's as well , but on Newtonions these work very well , so I suggest a high power star test , I will try and get to Peters when you are there next and give a hand if you want , PM me .
ps. my C9.25 could do with a tweek as well so maybe we can do both at the same time and its much easier with 2 people , make a night of it ?.
Brian.