You might want to reassess the "great" part. I would want a replacement Fender guard and deduct it from the cost. And ask him please not to use power tools to tighten the screws on your instrument.
Update:
I wouldn't make a big deal of it or go-Karen on this in any event. Especially if he's a good tech and you have a working relationship with him. But I tend to be more business-like with these transactions and I expect the same. Points to him for being up front and admitting the error. His lively hood depends on word of mouth and online reviews so he's motivated to make it right, I'm sure.
Stuff happens. But the home-made option wouldn't appeal to me if it is an original guard I would still want a Fender part deducted from the price. It's easy to do and I would prolly just do that part myself. If it's a 3rd party guard I'd let him make it (sounds like a lot of effort on his part) and call it even.
Last edited: Jan 13, 2021