On Wed, 26 Aug 2020 15:18:03 +0100, newshound
wrote:

Also, does it matter? Can't you attack it from the other side?

No, it's a blind void. And I'm *not* trying to arc weld it to the
floorpan like the other fellah said. I'm planning to jab the shaft up
against the car chassis while it's hooked up to the welding
transformer in the hope that they fuse together under the heavy
current. There is a variation of this technique in common practice in
pro body shops. Here's how it works in principle:

https://www.youtube.com/watch?v=jy_cVxfaq28