drawbore

A hole bored through a tenon nearer to the shoulder than the holes through the cheeks are to the edge or abutment against which the shoulder is to rest, so that a pin or bolt, when driven into it, will draw these parts together.

a drawbore pin

To make a drawbore in.

to drawbore a tenon

To enlarge the bore of a gun barrel by drawing, instead of thrusting, a revolving tool through it.