Thanks
I assume the flat washers suggested above are just another good protection but not absolutely required. I am going to use Hangar 9 ball links without washers but lock-nut +blue lock tite.

Note: bad news for me. I saw Silversurfer's white/red Gilles 202 in another thread. I will have to sell some stuff to get that beautiful plane!! The yellow/purple was not very attractive to me, just personal opinion!