Just with a jasper jig and a router you can do pretty small rings safely..
Just drill the hole for the pin, do the math to account for the .25" straight bit you should be using and cut the hole for the outside of the ring...then you can drill holes and screw/mount the center piece that youre about to cutout to a piece of plywood or something that you dont mind putting a circle into and cut the inside circle and you have your ring..with it mounted like that it's plenty safe imo and make sure the screws are slightly countersunk so your router doesnt get caught up on them
Louder. Lower.Team Tupperware
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'Horn'-wall: 12.75 cubes net, ~25Hz tuning
, 200 sq inches of port area (lowz..?)
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"If it's been done before, you're doing it wrong"