Brian
Anmedic supply a "Modura" rail system with solid, dovetail or heavy duty rails, good quality but expensive !
Saying that, one of the best things they supply is a Uni-Claw which is designed to and seems to fit all rail systems ( no ward refurb needed ). It is spring loaded so you can move it about easily and theres a mask hook accessory that screws into the claw.
Theres a few other good accessories too.
Bill Quick on 07968345477 will be pleased I am sure to give you details
Darren