This is cool for getting the old school vintage Fender look on a bass but I must say that it never made a difference on my bass apart from getting in the way of my slap technique. Perhaps these thumb rests died with the sixties and don't have use for the modern bass player. Just my opinion however, but this will get in the way if you play slap bass style, my hand got caught on it many times while popping or slapping through the G string. If your not a slapper though, it will look cool on your bass and you may be able to use in in your playing/technique, I just never could.
I fitted this to an old Fender Mustang Bass I had. The original was missing but the holes were there, and it was a perfect fit so no Messing about drilling etc. It's not a solid piece of material and could be over tightened, bending the sides so take care when fitting, but it does the job and looks good.
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