OK Jamie, here's what I did with my Model N recently and it worked the first time. Before I too was lifting the machine off the floor by the agitator. A word of caution: using the inflatable Agi-Tamers on these agitators will fold the agitators up and ruin both, which is why I never use my Agi-Tamer on a Maytag agitator.
1. Drill a small (1/8") hole in the center of the agitator post using a sharp bit. When I did this it drilled cleanly and did not look out-of-place.
2. Pour VERY hot water (not boiling) 1 cup at a time into the agitator post and wait about 15-30 seconds.
3. After this is done, grab the agitator post and pull up HARD with a side-to-side rocking motion. If the machine comes up off the ground then that is not a problem. Also, if the agitator does move and there is a considerable space between the base of the agitator and the tub, reach under there to get more leverage and keep rocking it. It should lift right off.
4. If that doesn't work, repeat steps 2-3 until the agitator is removed. Hope this helps!
--Austin