TubeNet

Saw this on Flea-bay. Besson euph in poor condition/ missing a valve. How difficult (read expensive) is it to have a new one machined. Or, is it possible to find one in another Besson carcass? I probably won't bid, but for the initiated, could be a rough diamond in the rough.

http://cgi.ebay.com/Besson-4-Valve-Comp ... dZViewItem