On Apr 22, 10:51*pm, "Califbill" wrote:
*What is a good backing plate to
prevent a big gob of aluminum slump on the backside, where I can not get the
grinder after I use the spool gun on the top. *If I had a TIG outfit, might
be easier, but only a spool gun. *1/4" steel plate? *Stainless plate?

I like copper.

Dan