Howdy Again
Maybe these photos will help.
This is an Uberti Cattleman. It is very similar in construction to a Colt Single Action Army. This model features a One Piece Grip. In this photo, the back strap has been pulled off the revolver, but the front strap, which is part of the trigger guard casting, is still screwed to the frame. With the back strap removed, the One Piece Grip can be pulled backwards from the front strap.
Here is a photo of just the back strap, trigger guard, and the One Piece Grip. Notice the One Piece Grip started out as a very thick piece of wood that has been carved out to receive the metal parts.
I have reversed the position of the One Piece Grip in this photo. Notice the serial number of the revolver has been inked onto the wood. That is because the way these grips were traditionally fitted to the metal parts was to grind and sand both the wood and the metal together by hand while they were attached to each other as an assembly. This would have been done before the metal was blued and before the finish was applied to the wood. Then the wood and metal were separated, and each went to their respective finishing operations. Later, at final assembly, the wooden grip was married up to the appropriate grip frame. The serial number on the wood was how they brought the correct parts back together. This meant that each wooden One Piece Grip was custom fit to the back strap and front strap of a particular revolver. Mix things up and the fit would not be so good. Yes, at least when this Cattleman rolled off the assembly line in 2001 they were still being done this way. The grip was individually fitted to the grip frame, exactly as Colt would have done it many years ago.
Which brings me to a couple of further questions for Bob.
The center piece in your 'one piece' grip needs to be the same thickness as the back strap and front strap. How do you get it down to the perfect thickness? Do you have a planer? Do you carefully cut it to thickness on a table saw? Or do you just sand the dickens out of it until you get it the right thickness? A former professional woodworker wants to know.
Also, do you do your final shaping of the grips with them mounted on the straps the way Colt did? I see you are using a brass grip frame. Have you ever fitted grips to a steel frame? If so, what did you do to prevent sanding away the factory bluing on the metal?