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When I first started spearing I did not have power auger. I use a chainsaw and a chisel and it worked great for years. I drained the bar oil first and then cut a few slots in the ice away from where I planed to put my shack.
Put two ice screws into the slab where you want the opening, drill two holes in opposite corners, use an ice saw to connect the dots in rectangle form, then use the ice screws as handles to lift out the block and again use them to put the block back in if you're a more mobile sort.
That might sound like a good game plan in theory but in reality the weight of the ice and the awkward position for lifting makes this idea unfeasible. A typical spear hole measuring 2 ft x 3 ft with just 12 inches of ice contains 6 cubic feet of ice. At 62# per cubic foot that block weighs in at 372 pounds. Most spearos cutting blocks keep them no more than 1'x2' and use tongs. Railroad tie tongs are the absolute best if you can find a set because they have a wide spread and very long handles preventing you from bending over. You can use your legs for lifting and pulling the blocks.We are already over 26 inches of ice on some lakes and now getting overflow on top of that. So you would need a cherry picker to lift that block in one piece.
Must be nice i can put the boat in where i fish.
as said , if you do drill them out, you will end up with a ton of slush that takes a while to clean out with skimmer
I used to spear on Eagle Lake, a few miles North of Willmar MN. That was too many years ago to admit. But I was young at the time and I used to use a spud to chip out the holes in 2 feet of ice when we went out. Too poor to buy an auger or an ice saw. Does any one put that much work in a hole these days?