My option- never. I don't have a blower/thrower.
When I run out of traction for pushing I shovel. If that's not a good option, I live in a neighborhood where 2500 size trucks w/blades are everywhere and they'd push what I can't.
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.