2.25" Dust Vacuum Plug

Overview
I designed this to fit the inside of a 2.25" vacuum hose adapter. Unfortunately there seems to be a lot of adapters with slightly different diameters.

Mounting
I mounted this to a piece of MDF using a 2" hole saw (close enough ;) for the main hole then clamped the flange as a guide for drilling the 15/64" mounting holes.
* 1/4" Flat Top Stove Bolts
* 70mm square hole pattern
* 100mm square flange
* 46mm inner diameter

Design
I've included the [FreeCAD](https://www.freecadwe