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An ice chisel is better than an axe, you don't get ice in your face with each swing.I use an old $20 floor jack from walmart but go easy or you can seperate the skis or frame from the house.STEADY PRESSURE AND KEEP CHISELING.I always block up at least 4" off the ice. The chainsaw idea is good if its really frozen in ,just angle the bar and just go in to the bottom of the skis .Not all the way through or you'll sink it, partialy. Patience and persistance and you not have to make costly repairs.