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im still using my old 6"jiffy. I use it with a drill now though. does all I need an auger to do. if I was going to buy a new hand auger to be used as such it would be a lazer 6". no more hand cranking 8"ers for me anymore. or any auger for that matter. haha bottom line make an adapter for a drill and use the jiffy you already have. note: if your jiffy doesn't cut very aggressively shim the blades with beer can shims. I did mine 30yrs ago and so have several others I have met over the years.
I'd love to see a picture or more details on how you shim you blades. Not that I need to do it on mine but I always love to know more.
place the shim under the edge side of where they mount and it will tilt the edge more of an angle towards the ice. before I did this it just shaved snow cones. lol all you need to do is loosen the screws enough to slide the shim under the edge. start with one and add if needed. copy?