how do i get stubborn prop off a 25hp mudd buddy bought the flat bar and 15" cresant but man that thing wont budge

Why two different threads

Cut it off.

Get a big 1/2" drive socket and cut it to fit over the hub and grab the blade and use an impact to get that bitch off.

Which MB? Sure it's not a hex?

Here's a thought. Thread on a nut behind your prop, weld it to the prop. Soak the living crap out of it with PB blaster or equivalent. Then take an impact socket to the nut and try to spin it off. That way if it breaks loose you can cut off the nut and reuse the prop. Good luck

heat the prop hub with out heating the shaft. move prop till it starts 2 grab again then reheat prop. if shaft gets hot, stop and let cool. repeat till prop comes off.