I'd be thinking pliers or something to reach in and grab it to pull it
out. You can crank it from the bottom using the allen wrench usually
supplied, but I don't think that's going to help much.
--
Dan Espen

The best thing to use is a garbage disposal wrench. ^_^

https://www.amazon.com/EZ-FLO-45101-.../dp/B00065DMQI

https://www.amazon.com/General-Tools.../dp/B001AMRRJ4

[8~{} Uncle Garbage Monster

up-thread was another good idea.

use a socket wrench with extension on the center nut

might be easier then using the allen wrench

m