steering coupler removal

I had trouble removing it from my 72 Dart. I sprayed the coupler around the roll pin with Kroil oil, unbolted the steering column from the firewall, more kroil oil, unhooked the tranmission linkage, a little more kroil oil, then blocked underneath the coupler, aligned it where I could see the roll pin, a little bit of heat, the with a round punch with a flat face, slowly tapped the punch with mild to moderate force with occassional heat and kroil oil and it gave up its fight and drove the pin out. I then took a crow bar and seperated the couple from the gear box inut shaft.
Patience, a little heat, and kroil oil did the trick for me. I work in an industrial setting with high pressure and high temperature and the only penetrate we use is kroil oil. Not trying to sell the product but I have seen it used on over 40 year old equipment under over 2000# of pressure and over 700*F heat and it penetrates and loosens. Just passing on what I have personally seen.