Silent Heavy Bag Joist Mount
grabcad
Mount I made to hang a 125lb punching bag. Features vibration damping mounts with a 150lbs spring so it doesn't transfer noise through the floor to the upstairs. 4x4 brackets/bolts/wood etc can be purchased from your local hardware store. The following parts are from McMaster-Carr:Vibration-Damping Mount https://www.mcmaster.com/60525K22Galvanized Steel Eyebolt with Nut and with Shoulder https://www.mcmaster.com/3018T27Steel Extension Spring https://www.mcmaster.com/9654K391
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