If you get a chance to eyeballit (that is one word isn't it?[>:])look closely to determine if the tail feathers are true to the fuse and align the middle of the upside down wing front to back visually then without moving notice if the wings have any warp. a little can be fixed say less then an 1/8 " off is ok. pull on the rudder, elevator and ailerons to see if they are on good. the original design of the PT 40 is just fine. the motor should feel SMOOTH all the way through some rotations and have good compresion. Don't mistake gunk in the cylinder for compresion though.