I've had a few issues with this step. 1st....I riveted the tip ribs onto the lower skin. Nothing was noted in the manual not too nor was there an ANOR for this. Rats....I had to drill out all the rivets (about 12) but since I'm a pro at drilling out rivets it was actually not too big of deal. Flipped the wing over and drilled out all the rivets and did not make any new work! With the Tip Rib removed I also realized that I have an issue with the channel parts that came in my kit. I have 4 AFT channels and no FWD channels. I need two of each...the part numbers are correct but the parts are labeled wrong. Sent an email with pictures to GA with hopes they can replace them when they ship my rudder pedals....soon. I'll continue as far as I can w/o the channels...still lots to mount inside the wing.