I find well-done repairs add character to the piece, and unintentionally "age" it for us...kick starts that program!
John tells of the time (each time we drill a rr hole) he had the bit run out the bottom of a blank. He made a "wear patch" to cover it and competed the gun-quite worried what his customer would think.
The customer was ecstatic to have a "period" repair on the gun for no extra charge.
The real kicker for the professionals, is that a mistake isn't
just a thing to fix, but it's a "feature" that is generally going to cut into the
beans and bacon money. A bit like having to stay over an hour, without pay, at an hourly job for each mistake you made. For the hobbyist, once you get over the "D'oh!" moment, it's a grand learning opportunity (re-learning for some) and bonding moment with your gun-making bros.