I have a BX25D with the 54" mower deck and man the mower deck is hard to attach . I follow the instructions in the manual step by step but it seems like if the deck isn't EXACTLY straight the arms won't go over the hook up points on the deck. This is how I am hooking it up ..... wheels up and turned sideways on deck , roll it under the tractor , hook up the driveshaft , start the tractor and lower the arms , line up the deck and arms. Lower the arms all the way to engage the pins. That's where the problem is , the arms fit way too tight just drop over the hook points . Am I doing something wrong ? Any ideas ?