Long story, but I ended up with 2 of these. It is a 1-1/4" 8 TPI UNS RH chuck insert adapter. $19 including shipping to the continental US. This is brand new and still in the plastic. Below is description from Teknatool website.
- Fits NOVA 1 1/4″ thread reversible lathes
- Internal Thread is 1 1/4″ 8TPI UNS RH (M6 Set Screw), to fit all 1 1/4″ 8TPI UNS RH lathes (NOVA Galaxi, NOVA Saturn, NOVA DVR 3000, NOVA XP, NOVA 1624 and 1624 II -North America)
- Precision machined from a solid billet 1045 High Tensile Steel
- Fits all NOVA Insert Type Chucks for maximum flexibility and adaptability
- Quickly and inexpensively adapt your NOVA chuck to almost any lathe depending on insert thread size.