You want your elevators to be aligned with each other as evenly as possible, so if that is not the case it is easier to correct that now by supporting one end of the horn in a vise and twisting the other side enough to achieve this. It is harder to do, or at least more unnerving, to twist and tweak horns in the finished plane.

Good luck with the magician--it is an excellent plane. Is yours flapped or unflapped?

thanks all, yes figured they would be equal just wanted to check, and it has fixed flaps.. this one is the Brodak kit, I actually have completed another Midwest version but did not do most of the build.  Im in Africa ( Work here back and forth ) Nigeria... so have a lot of down time so building is prefect. brought over a reasonable  amount of things but still limited.