Disregard, I forgot you said it was a cabinet.
Oh, it's not a cabinet. It's a Brinsea-20, like these: https://www.brinsea.com/c-63-octagon-incubators.aspx
ETA: it doesn't turn the tray, it turns the body of the bator. I knew that, I already have one. My mind is on vacation today. But that thing sticking out is what the cradle catches on to turn it.
I have 2 of the Octo 20's and neither one has that. They must have changed the turning mechanism - it certainly needed to be changed. :/ Does it still have the flimsy arm connecting the base to the motor? Does that piece keep the bator from spilling the eggs out if the arm breaks? That would definitely be an improvement!