Page 21-10 - how to fix twist in flaps?

[calvid]

I'm working on my left flap, specifically page 21-10 step 3. I've measured the twist as instructed and it comes out to 0.7 degrees. I'm not sure if that's acceptable, but if it's possible to improve it, I'd like to try. But the instructions don't tell you how to do that.

I'm not sure how best to clamp the flap down, or where (or how) to apply force to remove the twist. Any advice?

This was much easier with the ailerons, as the spar stuck out beyond the nose skin. I could clamp one end of the spar to the workbench and grab the other end with pliers to twist. But everything is much more flush on the flap and it's not obvious how to proceed.

 

[RayJay]

Have you riveted top and bottom of the nose box yet? If not, I just put opposite forces on the mounts, as in, I pulled one up while pushing the other down. If you already riveted the nose box, you are probably just stuck with what you have. Putting enough force on it to get the twist out would be damaging.

 

[calvid]

Have you riveted top and bottom of the nose box yet? If not, I just put opposite forces on the mounts, as in, I pulled one up while pushing the other down. If you already riveted the nose box, you are probably just stuck with what you have. Putting enough force on it to get the twist out would be damaging.

Thanks for the hint! Only the top is riveted, but your reply made me realize that the bottom is cleco'd. It didn't occur to me to remove them before adjusting the twist. Rookie mistake.