thanx for the replys, what it is is a twist in the center reverse gull part. the back rib tab on the left rib is supposed to be resting on the table and it's off about 1/16th of an inch. i'm going to go ahead and build the wings and fuse and if they come out good i'll probaly order the parts and redo it. every thing on the center piece came out soo good except that one thing, i hate to redo it but i guess i need to. thanx again.