The AMB Type 6 position Eccentric wheel is my Doctor Cheapo 1/4" thick Bossed interpretation. - The Drafting Table, Left, shown rotates at 20:1 via worm drive and 20T pinion and handwheel, Far right, with the Erinoid handle. - The eccentric wheel table and location pin can be rotated at 1:1, (2 x 1920's 40T Gears not shown) - 2:1 and 3 :1 (inbuilt) from a 1:1 drive on the Table shaft via a 1920's 25T Contrate and 25T Pinion dated from 19umpty-when. On the side of the Gearing Bridge is a Ratio control lever, the roller on which lowers and lifts the inbuilt 50T gear upwards after releasing the locking bolt so as to engage the 57T gear when tightened for 3:1 drive and vice versa. Note - When the 2 x 40T 1:1 gears are fitted they replace the 19T Pinion, 57 T Gear and the 50T gear must be raiesed.