Originally Posted by
John Powers
…and a few incompetent retired software salesmen. If you have a portable power drill you can do this with little expense. Go to a large hardware store (Lowes or Home Depot in the States) and buy a 2 inch drum sander accessory that chucks into your power drill. Also buy a package of three 2” sander refills. You will need an artist’s compass or dividers, not a navigational compass.
Start with a lens board that already has a Copal 3 hole. Scribe the correct size hole to use as a target. Make sure the scribed hole is equidistant from all edges. Lock lensboard in a vise using a rag on either side to protect the finish. Start grinding away. Frequently check to see the hole is growing in a perfectly round shape using the dividers at different positions on the board. Total investment, less your time, is $10-$15 in tools you may be able to borrow. Wear safety glasses to protect your eyes from flying aluminum chips and dust.
Got to get on with my retired incompetence. The dogs need a hike.
John
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