i posted a comparison shot a few pages back. :]
HT sure is keeping kitbashers at bay with this new MO. the only figure i know who has similar issues is ghost rider, that HS is difficult to port to another TT.
What i did was remove the second ring in the red skull sculpt with a screw driver. Then gently pounded the TTA adapter into the sculpt and popped it onto the TTA body. Actually quite easy and fits like it should.