Wonder if the schools liable .
Er . Sorry to see this . Recently did the same to my P-51 .
Make sure you dont get slack & agro and leave any bits to rattle in the wing .
A piece of 1/8 , 1/4 wide & 1/2 long is just right to jam in the rib half along it ,
and catch the bellcrank , rocking each time it comes past . Unless it jams .
Nice looking plane , theyll never see it there on the underside anyway .