I used something called a round floor brush grommet. They're available all over the internet. I installed a 5 inch to allow the hoist cable height cutoff to pass through, though I don't intend on ever raising the cable that high. Since the grommet screws into the drywall, I reinforced the drywall in the overhead with 1/4 inch plywood to add something solid for the grommet frame to attach.
I also used an Echogear Inwall Cable Management Grommet to pass the control cable through the ceiling. This was after I added about 20 feet of 4 wire control cable. The typical control cable on residential hoists is five or six feet long, totally inadequate. I now hang the controller from the garage door opener when not in use and left enough cable that I can move around from one side of the Jeep to the other as necessary. Rewiring the controller was simple, as the controller used spade plugs. And to keep gravity from doing its thing on the control cable, in the attic before passing through the grommet, I installed an outlet box with two cable strain reliefs. Again, available all over the internet, some even at the bog box stores. Just make sure to get the proper size to fit the control wire.
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