Knobs 245, 246 & 247
These knobs are all ¼” Yellowheart glued over ½” Red Oak. About 1/16” of Red Oak is later turned off the bottom on a lathe. Both grains are horizontal and at 90 degrees with respect to each other. So the knobs have a flash of iridescence from side grain of one or the other layer every 90 degrees. The iridescence of the Yellowheart show in the bottom image, but the iridescence of Red Oak in the top image is less evident. Knobs 245 & 246 have some metallic Inca Gold paint applied to cut grooves and crevices in the grain. All the knobs are finished with polished SG and Kiwi neutral shoe polish.
In knobs 246 & 247, the end of an 1/8” bamboo dowel shows in the top center. Because Oak has hard fine grain layered with porous softer grain, a drill can wander off center when drilling into it. So a 0.050 inch pilot hole was drilled down through the Yellowheart into the Oak. Then the holes for the 6mm potentiometer shaft and panel nut clearance were cut along it through the Oak.