Absolutely the first thing I do with any Wagtail handle. Simply can't use them at the normal angle, they just feel wrong.
Are you sure it's a crack? All of the grey discs have what looks like a crack on the upper jaw close to the screw hole. It's just a flaw in the mold, not actually a crack. Any standard channel can be used but you may have to either pack the jaws or soften and close them up a touch. Make sure however, no matter what channel you use, that the angle from the side, as you eyeball it, is as close to the Wagtail Original as possible.
I only use liquidator or Wagtail own ones but I have heard of guys having success with Ettore SS or Unger. Just be aware that the SS and /or the Brass channels add weight and can throw the balance out, but, still fun to experiment with.
