I've been working on adapting an old Pantograph to draw the inside 
profile of mouthpieces on a sheet of paper.  Its kind of rickety so 
far.  I made a 3/16" dia metal U-shaped probe to reach inside the 
MP.  I'm trying to keep the probe tip in line with the original 
Pantograph tracing point.  I also need a better mouthpiece clamping 
fixture.

Something like this can work, I just need to get the bugs out.

I think a better method would be some kind of probe that can be 
inserted horizontally at, say, 1 mm intervals and a vertical 
measurement made.  This would generate X,Y coodinates that could be 
computer plotted to make a profile drawing.  More tedious, but I 
think better.

I've seen high cost machines that can do this.  Large machine shops 
have 3D digitizers.

Anyone else have ideas on how to do this inexpensively?  I'd like to 
make records of some shapes before a sell off more of my mouthpiece 
pile.