Sorry, I will be going with the 8″. Evan P, thanks for the link. I can make that easy enough.
One quick question for anyone with a 6″. Do you find the hole to be to small with float in the hole for the flasher? I bought my son a Helix 7 Ice unit that has a float for transducer. I use a Marcum.
I like my 8″ hole but I think a 6″ would be quicker and easier on the drill.
Again, thank you for the replies. Buying the auger tomorrow.