Know all about this!
Had this same problem
You need a solenoid rebuild kit, DON'T BUY A NEW STARTER (besides their $200+)
plunger and contacts are made of soft copper and wear in time takes about and hr to change them out, and that includes removing the starter.
you need to order the kit on Ebay. $23 plus $5 shipping
get ahold of this seller (clickerfixer) and I know he can get you one
here is half of what you need,
http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WD1V
however email him tell him your problem and he'll lead you to the right kit (he's a nice guy)
The kit your looking at is only one 1/2 of what you need. You need these and the plunger that sits on them, you'll see when you get the kit. By the way it also comes with detailed instructions. He also has a website detailing this but I can't find the link. Any ?'s you can PM me.