Acme Lead Screw, 1/2"-10 5 start.

Does anyone nowhere I might be able to source some 304 Stainless Steel Precision Acme Lead Screw, Fast-Travel, Right-Hand, 1/2"-10 Thread. McMaster Carr have it in stock, but they won’t sell it to me in Australia, due to “export regulations”. They won’t even consider it if I use a Forwarding Agent. I have searched hi and low, but no luck. I have an existing Gatton Sidewinder CNC that I built 10 years ago and has been working without any problems until a period of no use, and the Lead Screws went a little rusty. So, they need to be replaced, I can't use an alternative. Any help would be greatly appreciated.