Here is a place that may just have that part for you broken welder/plasma unit

[PTSideshow]

They seem to have most everything of an electronic nature. I have gone over the site some what, they probably are the supply house that the repair stations buy from so the factory doesn't have to deal with it.Especially if it is an older model.
Here is a page on Hobart PC boards some stuff is in stock some not.http://www.plccenter.com/repair/default.aspx?Manufacturer=hobart&PartNo=&PartNoConj=Starts&Desc=&Specials=false&InStock=false&TopCategory=&Category=
:D

[Dawai]

5 second timer, good for the spot welder I am working on.. $13.50.. Normally $65

Cheapskate from Gawgia loves deals like that.. even better than that thou, I found one in a old box full of junk here..

Nice place, thanks.