Alright. So flush-mounting circular drivers is pretty straight-forward. But how best to flush-mount the irregular shapes, or objects where external dimensions are not a constant offset of the baffle cutout? For example, plastic horn flares or four-sided drivers.
From what I've seen, I have to cut out my own template from the shape that I want to flush mount, adjusting for the template guide, and use the template to cut out the indent. But how does one cut an accurate template? If I can follow a pencil line that well, I might as well cut the indent out free-hand, without taking the step of making the template.