Whenever a nut is subject to rotation, it is required to have a drilled bolt, castellated nut, and cotter key. In the top photo you can see that the proper bolt/nut combination is correctly used on the forward rudder cable link attachment, but not on the aft one. Similarly, in the bottom photo the nut on the control column, which uses a brass insert as a bushing, requires a castellated nut. If a bolt is used through a rod end bearing, the use of a fiber locknut is approved, as the bushing in the rod end bearing rotates instead of the bolt.
In Case You Missed it
STOL Brothers
A number of kit manufacturers have capitalized on the Cubs enduring appeal with Cub-alike designs, each of which has something unique to offer.
Limitations
Clint Eastwood (as Dirty Harry) once said, "A man's got to know his limitations."...
All About Avionics, Part 9
One of the final steps in getting your avionics suite to work is installation of some sort of antenna to capture various radio frequencies. Failing to choose the right antenna and install it properly can compromise the whole installation. Rather than focusing on the intricacies of antenna design, the author discusses the merits of internal versus external for particular equipment plus where to place them; by Stein Bruch
Searching for the Right RV-6
If at first you don't succeed, keep looking-sooner or later you'll find it!