Mathias Wandel is a Canadian engineer who can't seem to get enough of building his own machines. I'm one of his many fans, not because I think tradesmen should build their own equipment (it's crazy to think they would) but because the things he makes are interesting and clever.
In this video, Wandel explores the concept of turning a hand-held circular saw into a table saw. People have been doing this for decades, and it usually results in a not-very-usable machine. The base is screwed or bolted to the underside of a table and the original depth and bevel adjustment mechanisms are left intact—which is fine if you never change depth or bevel settings, but the moment you need to do those things you're forced to access the underside of the table.
To avoid that problem, Wandel strips the saw down to the motor and blade housing and clamps it into a form-fitting frame that will be screwed to the bottom of the table. This frame is essentially a homemade trunion. It pivots to adjust depth-of-cut and swings off a pair of hinges for bevel. The curved depth-stop gizmo and lock knob are also very clever.