Re: vacuum boxes and hold downs
Not sure how big guitar parts are bit sounds like you need a high vacuum gasket jig set up (if small).
A few threads cover the theory but long and short is small pieces are hard as they have a small area for the vacuum (really the column of air above) to push on.
And trust me they can fail at bad times too (is there ever a good time I ask rhetorically).
Look at all Star adhesives for gasket bits. Never used but I do peruse.
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