That might be a Royal or other very high quality part.
These are short and therefore must be very precise.

I don't know what pretty high is - but quality tooling costs.

If hobby grade is what you want then go that route.
I tried to buy the best I could and cheap out on the stuff
I could replace later.

If you take a machine and add higher precision/accuracy to it the worst you
get is the machine spec. If you add lower quality parts, the machine degrades
to the precision/accuracy equal to the worse values.

Martin

RBnDFW wrote:
Ignoramus5111 wrote:
By the way, I just received an email from Clausing. They have a Morse
4.5 to MT3 adaptor sleeve, part 7686, for $83.68 each. If I find that
my lathe works fine, I wil just buy it.

That's pretty high

But then I tried to find one online. I gave up after 15 minutes.