My bad; rather, my friend's bad. "
It wasn't me!" Yes, it was.
That image was of the old draw-tube from the old focusser. The diamond-wheel was secured after all...
Nigh precisely 8mm was cut off the end of the draw-tube...
The cut-off portion there is 7mm in length, or height, as the diamond-wheel is at about 1mm in thickness.
The rim at the end of the draw-tube was sanded and rounded...
The draw-tube was masked off...
I took a shot of the original interior, and for posterity...
The interior of the draw-tube was re-blackened. After I removed the tape and paper, I roughened the mirror-like end of the draw-tube's rack, and blackened it...
Unfortunately, the camera would not focus well...
It looks as though the end of the rack still has its chrome, but no.