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I just use my body as a brace and the drill slides down the side of my body.
Sounds dangerous---those cutting blades should be as far away from your body as possible in case they decide to skate
I recommend using the plate for stability, which equals safety. It does come down to the auger your using too, some like the lazer will catch on the bottom before breaking through, having the plate really helps with keeping a proper grip on the rig. As for the hub shelter anchors, I went with a speed wrench that I keep in the bag with the shelter.
Modify your Blue Mora, no walk, won't cut boots or feet, increase drilling speed. I used the K-Drill point design has better start cut than pointed design. Use flat spade wood bits for point. Welded 3/8" bolt to tip, drill & tap auger. Added a 0.40 shim to leading edge of blade increase blade angle. The agressive blades cut 1/4 to 5/16 ice per revolution of drill has a tendency to stop my Milwaukee 2804 so its used on gas auger for 30+ " of ice. I mostly use the less agressine version with reverse slush propell fins which push the slush 18" away from the hole under ice running in reverse. Drill speed using the less agressive auger is about 15 - 17 seconds on 20" of hard MN ice.
The clam plate is for guys who can’t handle a drill and need butterfly handles. I don’t use it and have no desire to get one. If your drill has a side handle on it you’ll be just fine.
Another variable is the size and type of auger attached. I use a 5 inch Lazer, and if the slush is just right, I wish I had more leverage for the grabbing. I look at the 8 and even 10 inch augers people expect to spin, and would never consider trying to hold the drill directly. I know Nils sharpens the head differently to be less aggressive in their versions designed for power- I see some modified manual setups that look like they require a lot of torque. If you really want to have the smallest and lightest setup, consider carefully how big a hole you need. That is the biggest driver of torque and power required.