Tool Rest Adjustment Collar for Wood Lathe

This is an adjustment collar for a wood lathe tool rest with 1" tool post (it will be too big for a 25mm tool post). It does not clamp the tool post, it merely acts as an adjustable end stop to quickly alter and set the height of the tool rest. The clamping force is provided by the banjo, as usual.

There is a commercially available product that does the same job, but there are a couple of differences. This model has a captive base plate ("sealing disc") that does not fall out, into the sawdust on your workshop floor, every time the tool rest is removed. This model has a greater range of adjustment and can be more quickly adjusted because of its coarser thread pitch. This model costs about a quid (£1 / €1 / $1) to print, but isn't quite as robust as the commercially available model that costs over 20 times more, although is plenty strong enough.

I printed in Bambu Lab PLA-CF Matcha Green and Burgundy Red. I used a 0.4mm nozzle, 4 perimeters (wall loops), 4 top layers, 4 bottom layers, 0.16mm layer height & 20% gyroid infill. No brim or supports are necessary

You'll need an M4 x 6mm cup point grub screw and an M4 Hex nut. The nut drops into the slot in the inner ring that's shown in the photos and, once the grub screw is fitted, is captive. The inner ring can be used either way up, but the outer ring is used with the narrower baseplate at the bottom.

Instructions for the commercially available product are available here (and also work for this model!):
https://robert-sorby.co.uk/wp-content/uploads/2022/02/TRAC-Instruction-Leaflet-Final-web.pdf 

If you want a collar to fit a different size tool post, or to make any other alterations, the original drawing is here:
https://cad.onshape.com/documents/5ac1fb1773c36594372e85e9/w/a826f0118218f308b6ea3d0d/e/2c0ab7ec17858b44c5cc9540?renderMode=0&uiState=66deecc4e8380a19d1d9377c