Spin welding rod

These are friction-welding rods for rotary tools.

In the 1980s, Mattel toys offered a plastic model building kit, including a rotary tool to weld the parts together. See Photo of the original welding rods.

This spin-welding / friction-welding technique is often used for 3D part repair and joining. Search YouTube for some videos.

I wasn't happy using regular 1.75mm filament as rod, and made these thicker, stiffer rods. They work much better.

One rod is sized to replace the Dremel collet. Remove the collet, insert the rod, and secure it with the collet retaining nut..

One fits a light duty, 12V rotary tool, $10 from Harbor Freight, in the same manner. Remove this somewhat larger collet, and insert the rod. http://www.harborfreight.com search "rotary tool". Item #63235 or Item #97626 are current valid item numbers.

The last is near 1/8 inch (3mm) diameter straight rod. This one can be inserted into any 1/8 inch collet, like any regular 1/8 in. bit.
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The Dremel is