IMHO, no need to replace them on a NexStar. If you are worried about them coming loose then use fuel line hose or safety wire. What I did was take the wire from the bread wrapper and use it. You wrap it around the clevis (making sure it does not interfere with the deflection) to hold everything tight. I have been using that for some time now and have not had any problems. For the larger planes I will build I will use the metal clevises because of the stresses that will be put on them.