Just got into the landing gear parts for a -12. Attempted to assemble tires, tubes on wheels. Maybe its just been a long day but this isnt making sense. Tube stem has a joggle that looks like a p trap. Checked all 3 tubes and they each have this configuration. Wont line up. Also the stem will be offset from centerline of the wheel by about an inch. Wouldnt think the tube will be happy in this position.