Has anybody ever used one of these "magnetic brass backers"? Susposed to cool the weld and reduce the heat distortion on sheet metal. Good news for a beginer or ad hype? Found it surfing the Eastwood site.

http://www.eastwoodco.com/jump.jsp?itemID=23462&itemType=PRODUCT&path=1%2C2%2C1397%2C1412%2C1417&KickerID=438&KICKER

Thanks
Brad

http://s320.photobucket.com/albums/nn343/brsdb3381/Tuesday_MY_56_Chevy/

56 3100 6 cyl