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The reasons I chose to modify the Walthers 90' TT and use the Atlas unit to drive it are these: 1. The author of the original mod article says it takes the slop out of the Walthers unit. I can't verify this because I never used the Walthers unit out of the box. 2. The Atlas unit uses 15 degree indexing. I plan to use the Atlas Roundhouse, #150-709, which is set up for 15 deg indexing and is a good looking model at an affordable price. Doug
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