Can anyone steer me towards a clamp-on scope mount for an early S&W Mod. 27? I don't want to drill it, and this one is not factory drilled. IF I could find someone that could blind drill the strap I might go that route, but I saw a setup on a Ruger, or Colt that clamped to the barrel and was pretty beefy. B-Squared site didn't show anything useful.