I'm assuming these "kelvar" belts are a new thing (Kelvar 1958??) What did they use previously.. Just a regular V belt? Reason being... I've got (basically) a 20 set-up, but my "shaft to shaft" is 15" Longest "comet type" belt I can find is 12-13" or so. Rather than going to a whole new drive unit (I see a 40, 7/8 belt with a belt that will fit), which I really can't afford.... Shouldn't a standard V belt work? (yes, I know I'll be changing it on occasion, but its an easy belt change). Will this work?