When speaking with Tom Hartman, he mentioned that for 2" track, you have to go with 8 tooth drivers, possibly implying that for under 2", stock drivers are ok. Without looking at my machine I can't say where the limit is... whether it will go to 1.5 or 1.75 on stock drivers. If you want to know for sure, just CALL Tom. His number is on his website www.hartmaninc.com
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