Gun Port Drill Jig directions:

"This is a drill jig I have designed and built. It is for drilling the two ears found on the Port Lid(s), Part no. # 97, in the Victory SM 23 by Corel.

The block or main body of the Jig is a piece of Plexiglas 3/4" by 1" by 1". It was machined to be square and parallel on all sides. It was also polished for esoteric reasons. The dimensions are .750" by 1.000" by 1.000"

That is called "toolmaking" ...... :)"