Hey Nez, Can you use one from a G9249 (Grizzly's 1236 version of your Jet 1024?) The manual states it's a 7/8"-8 tpi, though the part # says it's an M25
G9249 Dimensions
Bed Width.............................................................................................................................................. 7-1/8 in.
Leadscrew Diameter................................................................................................................................. 7/8 in.
Leadscrew TPI........................................................................................................................................... 8 TPI
Leadscrew Length..................................................................................................................................... 45 in.
Faceplate Size........................................................................................................................................... 10 in.
Feed Rod Diameter.................................................................................................................................. 3/4 in.
Floor to Center Height......................................................................................................................... 44-1/2 in.
Parts List:
https://www.grizzly.com/products/g9249/parts
Halfnut:
https://www.grizzly.com/parts/P9249316 $147