You might try taking a gander at the fully made ones at Japan Woodworker,
very nice prices, though you may want to ask them about the threads. they also
sell the USA made Dubuque brand which are nicer priced than the Jorgensens
elswhere. I have two (older NOS) Woocraft brand 12"ers that I am more than
positive were made by Dubuque, with acme type threading and are *quite*
well made. What woodcraft has now as their own brand are not USA made
and they don't explain the threads.
The thing about the Dubuques is that the whole clamp costs the same as the
Jorgensen kits that don't have the wood.
Alex - "newbie_neander" woodworker
Click to see the full signature.