I am curious, K&K has the twin spot for mandolin with two types of installation. One is a permanently mounted jack the other is an external mount. I am not about to put a permanently mounted jack in my mandolin end pin or side anywhere. It isn’t .25” and I am not drilling it out. That said I am concerned the external mount might leave marks on the outside. Does anyone have the external mount? Is it fairly gentle on the surface? Thanks!
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