HELP! Steering problem!
 

Help,
My good friend has a 21 ft. Fourwinns Horizon with a 5.7 liter Bravo3 with
the duo prop. He says the boat pulls left when going straight and EXTREMELY
hard to turn right at low speeds.
He says it feels like something is going to snap when he turns right and
he's no weakling. I've had him adjust his trim when he first get going but
says it helps little and he complains about a really slow hole shot if the
trims is more where it should be.
Any ideas?
Dan