Magnetic Copper Plate for Welding Up Holes On Car?

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Hi Guys,Long time lurker... I am working on a 60's muscle car and have been working on welding up trim holes.  The easier ones (for example the trunk) I reached one arm in and held a welding spoon to back the holes and hit it with my other hand.  Now I'm starting to get to trickier holes.  Was wondering, has anyone used one of these guys before?Eastwood 4 inch Magnetic Copper Welding Backer - Welder ToolSeems if the magnets are strong enough I could probably put that on the inside and hit the holes from the outside to weld up the holes.  Anyone used one before?  Pros? Cons?  Any other ideas that maybe I have not considered?Thanks ahead for any replies!
Reply:Hear is something you could make that would work. Attached ImagesTO INVENT  YOU NEED A GOOD IMAGINATION  AND A  PILE OF JUNK'' - THOMAS EDISONMost Of The Time People Don't see The Quality of a Good Job Unitl they see a Bad Job !! -Scott Esplin
Reply:I have used them and they work great for small holes.Just remember don't get in a hurry to move them as they get VERY hot and can make you have a bad daywww.georgesplasmacuttershop.comPlasma Cutter and Welder Sales and Repairs--Ebay storeTec.Mo. Dealer Consumables for the PT and IPT torch's
Reply:Seems easy enough to make by hammering a piece of 3/4" copper pipe flat and JB-welding some strong neodymium or ceramic magnets at the end.