Bought a bench-top belt sander off Amazon. Under $85 to my door in 2 days.
I 3D printed a jig for the miter guide on the disc table. This supported the 14mm mandrel for the carbon composite pivot tube so I could push the axial face up to the disc and rotate to sand it evenly and perpendicular to its axis.
The same jig was used to support the pivot tube for grinding the circumference.
Finished practice tube.
This did not work well. The resting table for the disc sander was hard to adjust perpendicular to the disc, the disc had ~ .020" of wobble and vibrated/kicked the part, the miter guide was not square, and the jig was very hard to hold while accurately advancing the part. The disc acting sideways to the primary plane of support also forced the part off perpendicularity.
I was able to produce about +/- .010" tolerance on the length and about +/- .020" on the diameter... which was mostly taper, the diameter was encouragingly round.
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