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Adventurous-Help2537 posted on r/vintageaudio2w
I use sorbethane pucks made for heavy appliances under the feet of my equipment rack, which probably weighs 150+ lbs full. About $35 for a set of four on Amazon. Search for “refrigerator feet” or something. Mine have cups on top to accommodate appliance feet, and a sliding material on the bottom for relatively easy positioning on hard floors. Found ‘em. They’re $46 for a set. https://a.co/d/0fHXw7hX