FiddleDiddle

About as large as the control panel on this. https://fiddlershop.com/products/tower-strings-acoustic-electric-violin-outfit Not suggesting this is a great instrument. Just using for size reference. Perhaps the hold could be covered with a plastic plug, if it needs to be covered at all.

Hi, I'm not a luthier (which will be come evident soon enough), just a fiddler in bar bands. I've recently learned how to set a fallen sound post. I normally have mine adjusted by a trained luthier, but I wanted to know how to do it in case of an emergency. This led me to a question... I've seen nice sounding instruments with holes cut in the sides for electronics (cable jack and or volume/tone knobs). So... if you can cut a hole in the side of a violin without hurting the sound that much, why not make another hole large enough for your fingers to set a sound post?