I had a request to post a picture of my open segment indexing fixture. The first version is shown in P1000955. The white, 12" indexing graph is glued to a 1/8" acrylic disk, and is changeable using two screws with threaded inserts in the 1/2" MDF mounting plate. The graph was made using Title: Free Online Graph Paper / Polar, and printed at Kinkos using one of their wide format printers. Printing rather than enlarging guarantees thin lines, which helps accuracy. I made 6 different graphs for different numbers of segments, using both sides of the acrylic plates. I found that getting the MDF mounting plate exactly centered on the turntable was difficult and this one was off about 1/32", so I added a second smaller plate, shown in P1000959, that is fixed to the larger one with bolts and threaded inserts. The holes in the smaller plate are 5/8" so it is adjustable and can be exactly centered. The upright is also adjustable and exactly perpendicular in both X and Y. I designed this jig after studying those used by Tom Lohman and Dennis Edwards. Mine requires no metal machining since I used a standard 1"-8 tpi lathe adaptor with a 3/4"-15 tpi internal thread (from Grizzly), which is secured to the 1/2" MDF mounting plate.