I know that you do not like them from an engineering standpoint due to the threaded pin. However, my counter-argument would be that our models would have to fly for so many hundreds of hours before that became an issue and by then we would have either crashed or got bored with the model.
You could then use a ball link or a standard clevis assuming you had enough clearance at the tail end to include the coupler as well as the clevis/ball
Thanks Mike - The metal control arm currently has a ball link fixed and changing it would require surgery. So a threaded push rod is my best option. Your second option in conjunction with some grooves in a plain pushrod to prevent any slippage would work (if they weren't nil stock) however , I could make one and there is plenty of room to fit it but back to my original post - a long Dubro pushrod would solve it in 60 secs and annoyingly i recently used my last one to draw a mains cable behind some plasterboard - home goal !
We all do that from time to time. Sometimes we get lucky though. A few days ago I did a little tidying up and threw away a strip of 120 ohm SMD resistors because I'd had them for about 10 years doing nothing. Fortunately they were still in the bottom of the bin when I got your email about spark suppression.