Used a router to make a channel in the hockey puck. Screw the puck to a piece of wood to prevent it from moving while being routed. Take the routed puck, another puck, and put silicone caulk between them. I used 1 3/4" construction screws to attach them together. Tightened them enough to sink the screwhead into the puck. Haven't used them yet, but I think they'll work OK.
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