I have a dent in the cover of my nice stainless steel grill...courtesy of a rubber biscuit. Last winter, the grill was perched up on my deck, about 15' off the ground and probably 25' from the closest edge of the rink. It was a slapshot off the crossbar...up in the air, clearing the 12'-tall tennis court fence...and right down on top of the grill hood. Awesome.
I'm Joe from Backyard-Hockey.com and EliteRinks.com.
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