Hi, thank you all for the kind comments. I ordered some India Ink to darken the engraving on the faux ivory grips and will give it a try. I did try to engraved a blued revolver hammer spring using my 2500mw laser engraver with zero success. The spring got warm, but there was no marking on the spring. I may try engraving the spring again using my 10W laser engraver. IMO metals have too much thermal conductivity to be engraved with these low powered laser engravers.
I think that the engravers may be used for cutting out shims like used on my Paterson to have the arbor align with the front frame pins. Brass shims may not work for the same reason that the blued spring didn't engrave, but a non metallic shim material may work. I will order some non metallic shim material and give it a try. I can use CAD software to create exact dimension shims.
Regards,
Richard