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I always block mine. I'm just worried that if the weather goes bad and I may not be able to get up there. I put it on 4 cinder blocks. I worry that if I use wood and they get frozen in I'll have to fight to get em out. I don't want to create a boater hazard with floating logs. If the blocks get super buried and I can't retrieve em (which hasn't happened..yet) I'll let em go to the bottom.
Dont use cinder blocks!. Use 4x4" blocks instead. You can chisel em out if they get stuck, Cinder blocks don't chisel out so easy. They sink and will melt into the ice quicker than wood block.