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Attach this platform to any piece of equipment with 2" to 3" wide tubing that lies across the floor, such as a weight storage rack, weight machine or power rack. Or you can bolt it to the floor.
Attach it to existing tubing as follows: Lift the equipment and slide this piece underneath such that the two plates stick up on either side. Then squeeze the plates together and insert the bolt to tighten them all the way. They'll stay pretty secure.