ORIGINAL: vertical grimmace
Where they fail is popping off the servo horn. (not slipping on the set screw) You would be much better off taking a threaded end and soldering it together, wrapping it with wire. Then you would have a clevis on both ends. Z bends are no problem with a good pair of needle nose pliers, I will show you one day at the field.
Even though no personal failures have been experienced, The reason why such rules exist in the rule book, is because they do fail. I have had it happen to me twice on throttles.
Kahlog, being one of my flying partners, knows how little problems I have with losing aircraft. These little details add up to making your planes last longer. I would not trust thousands of dollars to saving a few minutes and a few cents to a control surface termination that is known to be sub standard.
Please do not think I am being condescending, I would just hate to see anyone lose a plne because of this.
as a follower of this thread I felt compelled to note this inaccuracy with EZ conenecors, I also have several of these EZ connectors on a few planes, firstly if you tighten them and use loctite on the set screw there not coming loose,the use of a small flat on the pushrod also insures that there is almost no way that the pushrod will slip, or move.
I need to try the JB Weld idea,I like that.
secondly there is no way that a Dubro EZ connector is coming off when using the metal permanent clip that comes with it unless you destroy the clip and the connector, the amount of stress needed is way more than a control surface is capable of producing under even extreme flight conditions,I know this from destroying several of the EZ connectors trying to remove them from servo horns, and then trying to reuse them unsucsessfully afterwords.
if your using the rubber removable retainer, then there is a chance the EZ connector can come loose from the servo horn under stress, and should be used only for throttle or accessory type uses, its why they come with the 2 types of retainer clips.
if you have had trouble with them coming off then you should use the metal retainer then they won't come loose for sure.
I have also used the Hangar-9 connectors, savaged from discarded retracts, that use C clips,and a washer, for the retainers with no problems.