When I was cutting out the notches for the braces in the side of the guitar I made a pretty big mistake, twice. Using a flush cut saw that was probably a bit too aggressive for this purpose, I cut too deep into the sides and tried 2 different kind of mends to see which one I liked better, and which one I would be using if it were to happen again. The one example is where the saw dug in more than I wanted and I just tried to fill the cuts with a mini rosewood wedge. The other was the same exact thing, but instead of filling a wedge, I cut it out deeper and was going to put a patch in with the same grain.