It more likely a straight shaft PTO. It is a good chance that since you are bending the adapter that it is seized on the shaft. It looks like you're in for replacing the adapter once removed and you would heat the union while attempting to pull it off. Someone probably didn't use anti-seize compound when install the adapter.
Here when I get a Cub Cadet ZTR that needs a new drive belt I usually end replacing the pulley because seizure. Cub never used anti-seize compound and it is a shame that I must destroy a good pulley because of this.
