With a 29:1 gear ratio and a Pittman DC-71 motor, the speed at 12 V was above 90 SMPH. Replacing with a Kemtron (PSC -KTM) 80 pitch 37:1 gear set dropped this to about 70 SMPH, a more believable speed for a "Lollypop". Gears were pulled and new worm installed on motor shaft. After pulling driver and gear a 40 tooth worm wheel was mounted. All drivers were requartered to assure the same 90 °.
Since the original shaft center distance was .500" and the new was .318" for a difference of .127", the motor tilt angle had to be increased. The front mounting pad was milled to lower and the rear angle bracket was raised by bending. Later Bowser versions used a smaller worm with .373 center distance and NWSL 36:1, 72 DP has .330 for a difference of 0.043, which requires less tilting. Some shimming may be required to obtain proper mesh.
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Tilted motor with NWSL worm.
The same method can be applied, using Bowser's frame.
