Darryl Keil
 Posts: 1454
Joined: 2003-05-22
Location: Maine
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Mike,
If the neck is not on I think you could make a bladder work just fine, definitely at low vacuum. You would want to pre-inflate the bladder so it fills up the interior space before applying vacuum.
Here's what I would do if you really want to do this. Make a stiff carboard mock up of a guitar and try it on that. Since it will be weaker overall than the real thing you will get the feel of how to use it and how much vacuum to apply. Another option would be a mock up out of 1/8" ply, probably closer to an actual guitar.
Darryl Keil
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