Geez...I have never even considered a 'partial flip', or more appropriately a 'shift.' Usually when I hear these 'flip' stories I start tuning out. However, a small shift deserves my attention, lol. Now, give me some insight into how/why would this 'shift' occur?....and when did they/it occur. (See if you can hit one of the 'tree ring' catastrophy dates, huh)
The story we heard up in Hapgood's hometown was that ice would accumulate near the poles, but not symmetrically. Eventually earth's wobble, which normally has a precession rate of once per 22,000 years and an arc of 23 degrees radius gets more unstable and shifts in one day to a new point of stability. Spinning tops do this. The crust itself might shift without needing the entire core to move as well. That would stir things up. It might also 'splain what happened when Joshua fit the battle of Jerico and the sun stood still or went backward or whatever it did.