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If you take the cut off end and split it into two pieces, you could rubber band one to each end. The rubber bands would help with the sliding (like the O ring) and the added dowel would keep it from rolling.
While you're not freezing it solid .... if you boil the water first, you will not get "cloudy" ice.
Removable, Custom bumper stickers
Charging Station Breadbox
Floating Dock with Barrels (UPDATED)
Make Foam Look Like Carved Granite!
foam sandblasted sign