QUOTE(Misterioso @ Mar 1 2009, 02:22 PM)

QUOTE(bohemian @ Mar 1 2009, 11:34 AM)

Go to a luthier and get it properly replaced. It shouldn't be too expensive, esp if you get a rehair at the same time.
Surey a re-hair would make it expensive! - My last re-hair certainly was, and I wouldn't recommend re-hairing unless it actually needs it.
It's called a thumb grip, by the way.
My luthier does a "tidy-up" job (thumb-grip, straightening etc) for free or a very minimal charge when necessary when I get a rehair. Apparently this is quite common. Should be able to get the lot for under £50 easily, outside of the bigger towns. I suppose expensive is relative, and depends on the value of your bow!