I have a Moon JJ-5 bass that has a Thick, clear gloss finish that I Assume is polyurethane. The previous owner apparently tried to Mickey Mouse a truss rod adjustment. I've included an image of the dent I'd like to repair. However, I don't want it to appear that I put a noticeable glob of some clear material on it. And yes I am a bit of a fanatic about keeping my basses in mint condition. My first question is - can it be anything else other than polyurethane, considering the thickness? Next what is the best approach to repairing this so hopefully the repair is essentially invisible. I'm good mechanically and with tools. I regularly remove scratches in finishes, etc. so I'm confortable executing the repair. I just need to know the best procedure from someone with experience in this area. Thanks in advance for any responses.