2k3 interchangable heads?
 

I know some of the turtles heads can pop off. Do they all have the same style ball joints? Which series have interchangeable heads? I wanted to try to create my "ideal" loose turtles.

I think maybe they pop off of the Fightin' Gear Turtles and any other figures they used the same molds for (those got recycled quite a few times).

I know the 2k7 figures can pop their heads easily without getting broken.

Off the top of my head, the Fightin' Gear, Mystic Fury, and Paleo Patrol figures have ball-jointed heads. You can see one headswap here (as well as a tip for improving the neck range):

http://www.articulateddiscussion.com...ion-Piece.aspx

One of the action features series has ball-jointed heads too -- I believe it's the Shell Kickers. Pretty sure there are others as well.

I totally want moar 2K3 TMNT heads. :D