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Jibbs... You want to answer this one?
I started to laugh when I opened up the page and saw your name...lets be polite...leave the horse in the barn....by the way...10 inch
if you are keeping the old auger and staying with the same brand couldn't you use the old bit with the new powerhead? Then you would have an 8 and a 10. I bought an 8" jiffy pro lite and I am hoping I can swap out the bits on my jiffy 10"
About the time you lose a monster in an eight-inch hole, you'll wish you had a ten. I've heard that might mess up the transmission on the power head, putting a larger bit on there.
You could certainly downsize from the 10 inch power head though. Why Not? Buy a 10 inch pro 4 then an 8 inch bit and you have both. Pricey. I will likely do this someday, but not until I have so many other things I could better spend a couple hundo on.
In which scenario would you want a smaller hole?
I have been playing on the ice for over 20 years. That said, I only recall a few times stepping in a hole or someone else in the fishing group doing so. None ever resulting in more than a quick jolt to the heart , no wet feet Are people just not paying attention when this happens?