Ok...so we are trying to remove a PTO coupler on a 787 Engine and it is not coming off. I used an old driveshaft and bent it to use as a removal tool. We put rope down the PTO side cylinder to "lock" the motor up. We have heated the pto, and even put a breaker bar on the makeshift tool we made and its a no go...How hot do you have to get these things? Also how much force does it take to get these off?