I agree with the above posts.
I sold my WallyTractor in favor of the much less expensive "Cart Align" tool. I preferred the "Cart Align" to both Wally and the Graham set up tools. The Cart Align uses the tracking force of the cartridge during alignment of the diamond, placing the overhang and azimuth at actual play conditions.
The Graham estimates that distance and is frequently off several thousandth's of an inch. The Wally takes this into consideration but is a different formula than "Cart Align."
Don't forget to take track force into consideration with all settings. As tracking force is increased or decreased, the VTL and overhang are altered as well. Sometimes this requires going back and forth a few times to get it perfect. For this reason I like the repeatable results of the Winds stylus force gauge ( the 1/100 th's gram). By presetting my cartridge to the weight I know will be near perfect, the other settings are close to perfect the first time you go through the setup.
I sold my WallyTractor in favor of the much less expensive "Cart Align" tool. I preferred the "Cart Align" to both Wally and the Graham set up tools. The Cart Align uses the tracking force of the cartridge during alignment of the diamond, placing the overhang and azimuth at actual play conditions.
The Graham estimates that distance and is frequently off several thousandth's of an inch. The Wally takes this into consideration but is a different formula than "Cart Align."
Don't forget to take track force into consideration with all settings. As tracking force is increased or decreased, the VTL and overhang are altered as well. Sometimes this requires going back and forth a few times to get it perfect. For this reason I like the repeatable results of the Winds stylus force gauge ( the 1/100 th's gram). By presetting my cartridge to the weight I know will be near perfect, the other settings are close to perfect the first time you go through the setup.