It's a thought. I don't have exact dimensions with me at the moment
The nut, thrust retainer, handle and screw are all missing (had to be removed before someone could dismantle it to put in the skip).
The nut & thrust retainer will be about 1.5" diameter by 2" long, the thread was probably 1-1.25 " diameter x 16" long with 4" in the thrust retainer and square for the handle. The Vice is Imperial in its threads.
My plan is, at the moment, to use a 500mm section of M20 studding I have that fell off a truck at the local roundabout (one of 20 and they ripped open several tyres before we cleared them up, I kept the undamaged ones & recycled the others), machine the end for the thrust retainer & handle. Machine some 50mm bar and thread the inside M20 x 2.5. The handle I'll make up from plate and a turned hand grip. The M20 thread looks a bit skinny(!), but it'll be more than strong enough for any use I could possibly put the vice to.
As for doing a 'Proper Job', with an LH ACME leadscrew etc. I looked at Ondrives & E-Bay, and they weren't wildly different in price for a 24-25mm dia leadscrew & nut (£66 & £25 respectively). That ends up making the vice a bit pricy for something that came from a skip and is probably too big for me to use anyway.
Regards,
Richard.