Small print-bed 4 inch dust port and blast gate spacer

I recently bought a dust collector for my woodworking, and wanted to use some blast gates. Unfortunately, I needed more than I had, and also wanted to be ready to add 4" dust ports to any new machines I may get. I made a quick and dirty dust port that could be screwed onto almost anything, and that prints on the bed of a Monoprice Mini and a small spacer so, with some super glue 1/4" plywood, you could turn two ports and a spacer into a serviceable blast gate, though it can sometimes use some