Toolpost Morse Taper Shank Tool Holders

[Toolmaker51]

Very interesting. Quite a haul of stuff on the table too! I also looked on the taobao link and not speaking Chinese would make it impossible to navigate. I would not be able to mount those adapters in my tool post, but it makes me wish they made index holders like that for R8 collets. Thanks for posting.

You could reproduce the R8 contour in flat bar stock if your lathe has 4 jaw and compound for the 16' 51'' included angle.
Best would probably be off-centered to allow milling a 'spline' that fits your toolholder.
Bore through for a good fit on collet body, counterbore to receive washer.
Make a drawbolt and thick washer with corresponding boss slip fit in toolholder. A square-head bolt offers better life span.
I'd make 3. 1 w/ center drill. 1 w/ small drill chuck. 1 w/ R8 bore.
Bingo.
Unless you have a lantern toolpost.