On the rudder and elevator the nylon clevis have silicone tube retainers on them but the the swivel clevis on the torque rods have no retainers where the swivel clevis attaches to the swivel does not appear very secure should there be a retainers on them and also on the fast links?

The faslinks don't need them. neither do the clevises really, but it's cheap insurance.

You can just cut a 3/16" piece of fuel tubing, push it over a needle-nose pliers, open the pliers to stretch the tubing and slide it over the clevis

The problem putting them over the fastlinks is that the rubber ring can bind up with servo arm when it goes "to the rear". If they are the right size that is. (don't, for instance, use a 4-40 quick link on 2-56 linkage)

CGr

Use a z bend on them, and commas in your post.