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This topic has been brought up on TY before. Some creative pioneers created this product years ago. I think the primary topic of concern was with regards to life of the jackshaft where the needle bearing runs. Does the needle bearing (which is a pretty hard metal (52100 chrome steel)) begin to wear a groove in the shaft (lesser hardness than the needle bearing) after miles and miles of running? So does the needle bearing gear last "forever" but now the shaft needs replacing after "X" number of miles?