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I don't see the PDF I attached so I'll try again. Here's a link. https://drive.google.com/file/d/1PqwSaROB7cOVJKzclLehSwESOu3DkSia/view?usp=sharing
Ron
Impeccable job Ron. I saw the one cab at IA DIY and am always impressed by your woodworking skills. I bet they sound great too.
I used a jasper jig and a 1/16" (IIRC) router bit to cut a shallow grove that matched the OD of the plastic port tube. Then I flipped the board over and fastened it to some scrap with double stick tape so I could cut the doughnut with the jasper jig. I made the inside of the doughnut hole just undersized and put a piece of scrape cut off from the port tube in the grove I'd cut on the back side and held it in place with some tape while I used a top bearing bit on my router table to get the ID of the doughnut to be an exact match to the ID of the port tube. I used a small round over bit on the router table to round over the inner and outer doughnut edges by taking shallow passes while holding the doughnut against the router bit bearing my hand. I'd marked the holes for the screws before I started cutting and did countersinks about half way through the doughnut with a forstner bit and then I drilled the through holes. After I'd finished the doughnut I used some Loctite 5 minute epoxy to glue the port tube to it.
Ron
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