Dave Rawlings m
writes:
Instructions state output thread is 3/4 x 16. Ordered a 4-jaw chuck that will
not seat tight. Measured lathe thread - it comes out .701 (11/16) x 10, NOT
3/4 x 16 as mentioned in the instruction book. Is there any way to use this
chuck?

Hmmm... could that be 18mm x 2.5 ?

(not that it helps)