Evan Ellis and I were going to do a “What is this Mystery Jig?” Contest (kinda like the “Mystery Chord”) but we changed our mind (this time!) as we thought this might be too tricky.
At left are the fingerboard gluing cauls (one for each model) used to glue the fingerboard blanks to the necks. (R): The underside of one of the cauls.
So, as they say, the jig is up!