Can anyone tell me the proper size and pitch of the screw used on the original puller tool?
I would like to see if I can source the proper bolt/rod to build another puller that can exert more force.

Background:
Got another stubborn hub.
Tried removing with a hub puller. No go.
Left it on overnight. Tried again. No go.
Heated hub with oxy/acetylene torch. Applied puller. No go
Taking lug nuts off resulted in damaged threads and one broken stud.
Chased remaining thread with a die and cleaned lug nuts with a tap
(lesson never learned, always do a good job of restoring rusty old nut and bolt threads before use)
Tapped the broken stud so that puller load will spread equally.
Plan is to heat again and leave puller on overnight and keep trying before cutting off.

My puller is homemade and uses a 1” UNC bolt, 8 threads per inch. It may not be sufficient for this job, but it did work on my PV.