Prephaps I can chime in here. I was one of the original cheerleaders for the Borg 7315 Helical focuser. You will have to find a machinist to modify the nosepiece. Regarding the slip-fit adapter tube, one can tap another hole, for a 2-point anchor. Lastly, add a piece of brass sheet to act as a shim to hold the nosepiece. The advantage of using a helical focuser is that one can re-focus without changeing the FL. This is especially useful during photography, where images are to be stacked; prohibiting the FL changes.
-------------------- Nikon D40/D50/D70 DSLR
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WO Zenithstar 66SD APO (Black 'n Blue)
WO 8 x 45mm APO Bino
UO 20 x 80mm Bino
Vixen 80SS Refractor
Orion 127mm Apex Maksutov
Vixen GP-DX with Skysensor 2000
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Re: Axial Port adaptor? - choices?
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