Several years ago I bought a gizmo at a woodworking show called
AccuJig for making box joints.
It consists of a metal angle bracket with 1/8" slots spaced 1/8"
apart, with plastic templates that snap on blanking the unused slots
when working with various width pins and tails.
The gizmo has a bolt at each end to trap the pieces to be joined, and
is indexed by a 1/8" pin set on top of the crosscut miter gauge.
I can't remember how to set up the spacing for gang cutting a box.....
Google turned up nothing - anyone have a copy of the instruction
sheets that they could share?