Yea, this, and to greet the incoming light...
The position of the draw-tube, at its farthest inward travel when using an eyepiece, and practically flush with the housing's flange...
The position of the draw-tube, at its farthest outward travel when using an eyepiece, and with no threat to the stability of the draw-tube within its run...
Even when the draw-tube is racked fully outward, where no eyepiece is used, the draw-tube still exhibits no slop whatsoever, as tested...
The
touche finale; again...
Voilą...
I had used said tape.
The new focusser is completed.
Incidentally, I've decided not to use the flat and lock washers that I had gotten with the screws for securing the focusser to the optical-tube...
Just the three screws are quite enough to secure the focusser...
But I will need to shorten all three, as I don't want them to protrude past the surfaces of the nuts epoxied on the inside of the mounting-flange.
Presently, it's a bit cold, and wet, outdoors. Although, in a few days I should be able to resume testing of the doublet.
But, will the Moon be out by then? I can't win for losing.