Mark,
I have a spare Burke #4 for parts and the table lead screw and the bronze nut are good. the lead screw does have a problem where the handle mounts it needs to be repaired.Of interested let me know I will call you or email you at your email address. This machine has a 16 " table. I know what the lead screw nut is I replaced the one on my #4 the new one from DC Morrison was $ 70.00 plus shipping. I salvaged the old part and I ordered a round nut from this place <
http://www.roton.com > and I put it away for a later project …well I guess I lost it or misplaced it, someday it will turn up.
let me know if you want the nut or anything else.
Regards
dgehricke