DumpsterCNC parts needed:
three each all 1/2"-8 ACME 2 Start (4 turns per inch)
http://www.dumpstercnc.com/leadnuts_acme.html http://www.dumpstercnc.com/leadnuts_flanges.html
Add a 1-3/16" machined square flange with (4) .144 dia clearance holes.
http://www.dumpstercnc.com/thread_clamps.html
Joe