I don't think that the result of the experiment means that the Sherline toolholder does not conform to industry specs. l I think that the result suggests that an insert with a smaller clearance angle will be large on a toolholder that is designed for an insert with a larger clearance angle. If that is correct, then the result is applicable generally.
If the DCGT insert had fit well on the Sherline holder intended for a DPMT insert, then I think that would have been good news to share on Sherline forums.
