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I've just found this frustration myself two nights ago.
I paid $150 for a Feldstein #6 adapter, which is a Takahashi adapter designed specifically to be bolted on to an STL-11000M and the other end on to the end of the FSQ-106. It, therefore, negates the use of using thumbscrews on adapters.
I finally got a chance to install it on Friday night. Come nightfall and I go to focus for the first time, what do I find? I don't have enough backfocus in the focuser drawtube to come to focus! I fell short by about 1.5 cm. ARGH! $150 down the drain, or, rather, I now need someone to create me a spacer/ring which will give me that extra 1.5-2.5 cm. Frustrating, to say the least.
H
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