Repair info on a TAG

Need TAG repair information. I have an old TAG Chronograph quartz diver, probably close to 15 years old. Anyways, it works but my son had it for a few years. I recently got it back the the part that the screw down crown goes on is stripped. I asked him how that happened, he thought you really had to tighten those down hard, very hard. I guess over the years it finally wore it out.

Is that a part a good local watchmaker could deal with and is it expensive?