I intended to title this message 'Warp struggle' but I'm not too sure that this is my case: therefore I'm asking the Forum.
Assembling the Mark IV gave me a struggle at the elevator. I was able to get the elevator and the moving elevator-rudder together. Trying to attach the hinges, though, seemed a problem. The outboard and inboard hinge of every rudder-blade where lined-up, but the middle-one of each blade seemed to be out-line for 2-3 mm: It looked if the hinge-side of the moving rudder part was welded in a large radius.
I was able to get the two pats together, though.

But moving the movable part of the elevator now moves the whole elevator up-and-down a bit: there seems to be tension on the parts, and by moving the elevator up and down the tips of the fixed part move some 4 mms - at each side.

Is this what you call warp? What can I do? Is there something I CAN do?

Thanks for reading & answering,

HansLab