Both of them needed a touch - really not much but you know how little it takes to cause interference.
One was bottoming on the end of the stub, the other was touching on the sloping part but a few careful passes with a vixen and then polish with 320 sorted it out. They are now snug.
There was also a little on the bottom skin which was easily sorted.
We were lucky to be able to assemble on the front lawn on a warm day, so no time pressure - just frustrating on/off/on/off.
When you are doing that - make sure there is no forward motion on the wing as you remove it as the skin of the slot at the front of the spar opening is unsupported and can easily get marked or damaged.
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2018