"Jim Harvey" wrote in message
First picture is the hinge assembly. Steel plates, half inch carriage
bolt with a sleeve of 3/8 pipe over the threads. The smaller plate is
drilled to fit the outside diameter of the 3/8 pipe and forms the
bearing surface. It's quite smooth swinging about 170 pounds of tool and
table.

Nice design. Did you need to use any Loctite or threadlocker to prevent the
nut from coming off the bolt?