I designed this cap for use with the Camco brand stack stands https://www.amazon.com/gp/product/B000760FX4/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
The problem being solved is our drop down gate on our RV has the typical rubber bumpers installed to protect the gate from damage when it's resting on the ground, however we are using ours like a deck so it needs to be elevated. But placing the stands under the rubber bumpers is a bit precarious at best and the gate had a tendency to slide off the stands.
So to prevent the jacks from being knocked out of place accidentally or dropping off the bumpers I came up with this cap, it fits snugly on top of the jack and perfectly into the bumper securing the jack in place.
Even though this does fit tightly on the jack screw I did create a little recess so it could be permanently attached with silicone.