Marking Guide Puts Biscuits in the Right Place

I used to guess where a biscuit slot should go, but now I make sure. With my biscuit joiner, I cut slots for #0, #10, and #20 biscuits into a piece of scrapwood. Then, I marked the centerline on some matching biscuits and glued them into the slots as shown at top. Now I have a handy guide that shows me where to cut when there's no room for guesswork.
—David Whiting, Townsend, Mass.