Roll up some copper pipe, solder on 10 gauge wire. Done.
I inherited a small welder (not Miller brand). It had no plugs nor cables. I bought some Miller plus. They didn't fit but they were close. They also cost $28 and change, each.
Being a crafty cowboy I figured I could figure out something better and cheaper so it was off to plumbing aisle.
This is a fun little project for parents and children where you get your hands dirty with metal working and electricity. You get to explore how to use a variety of metal cutting and shaping tools with a nice soft bit of copper. You get to solder something larger than an LED. And best of all, you get to save serious money by making part of a tool. The steps laid out here are readily applicable to lots of other copper objects you might want to make.
Step 1: Materials
10 gauge copper wire.
Electrical tape and shrinky tube.
Torch, vice, pliers, hammer, hacksaw.
Step 2: Cut
Open the pipe up. Do not squeeze it together at first like I did here. That was a mistake.
Step 3: Roll It Up
Step 4: Check the Fit
You may need to adjust the last layer of your copper roll to fit your socket snugly. Pry it open with a screw driver or slice a bit off if it's too big.
Step 5: Solder
Strip and tin the wire too.
Put both together and melt the solder together. Remember to hold them until you see the solder snap into solidity. This may take a lot of seconds since these pieces are not teeny.
Step 6: Make Another and Insulate
Electrical tape and/or shrinky tube would be good to put on your new plugs at this point. I really should do that in case someone licks them or something.
Anyways, that's it. Be safe and enjoy.