Rigid set-ups = safer machining

[Toolmaker51]

All this drilling work brings new set-up fixes. Most aren't through holes, but necessary on this 1.5" x 3.0" x 10' tube. So, can't rest on table.
Ends are elevated on 3/4" flat bar, under clamps in free area. 3" wide makes it difficult to open an adjustable parallel, not only being 'too valued' for such application. 1-1/2" drill will apply considerable pressure.

To alleviate flex in middle of tube, a quick bit of diagonal sawing rendered these opposing wedges. Used bar clamp to set and hold position.