The Vx derail was a very good derail even though Suntour sold it as their mid range derail. The Vx derail outperformed ANYONE elses top of the line derails in it's day!!! And it lasted as long as the others top of the line! Those Vx derails can still be found NOS and NIB on E-Bay and they don't sell for much if it needed replacing which it doesn't sound like it does.