Once again, thank you for the info. I'm looking forward to trying it out.

Thanks for the info, I'll give the bump another try, and perhaps add a thumb switch too.

Tried the bump on/off, seems to work, but I'm worried that it may not be too kind to the old machine.

I am welding with an old Miller 330 A-BP. I'm having a hard time welding anodized marine tube. I find that I must remove all of the anodizing with abrasives before I can make a decent weld. This is very time consuming and tends to leave scratched areas around the welds. Would higher frequency (200 h...