I have a SA "loaded" fullsize that I sent to Don for a few things -
dehorn (with specific instructions to keep the lines still clean, not overdone)
Replace 2-pc guiderod
Checker frontstrap 25lpi (I believe P. Single did the work here)
Install dovetail front sight
Virgil Tripp matte hardchrome
The work was nicely done, and the SA has remained reliable. The dehorn was done to the specs. requested very well.
I would recommend his work.