I welded up a bunch on my new bedside a while back. I took a piece of 1" copper tubing, about 8" long, and beat the end flat and gave it a little bend. I use that as a back up behind the hole when welding it up. Just take it nice and slow, little spot welds not long plug welds. Also use one of those 3m wheels on a grinder to remove the paint first. Enjoy! 
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Andy,Phx AZ
'67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...)
"23 C-Cab-sold
'48 Ford 8N tractor(still working)
'67 Scout(Now on the road)
'70 MG B.-sold
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