Interesting the comment about the "filler" being needed...

I have asked many times what S&W had in mind all those many years ago for how you should hold & shoot a revolver bearing Magna grips. Nobody has ever answered me.

Maybe nobody knows what the mothership had in mind. They sure do look purdy (IMHO), but I admit that I'm still not sure how the gun was intended to be held without a space filler.