How do you remove J style yokes?

[AndreiC]

I want to remove the yokes on my 70E. They have at some point been replaced with some J style yokes. 
 

I got out fairly easily the PTT button and other electrical switches for the autopilot (electronic STEC 30, not original vacuum one). I also removed a long-ish bolt that went left to right through the base of the yoke and the steel tube. Right now nothing seems to still keep the yokes attached to the steel tubes, but they still don’t move at all and won’t come out. 
 

what is the next step?

[Vance Harral]

There is a set screw at the bottom of the yoke, meant to take up any shaft-to-yoke slack that remains with the structural bolt installed.  You can only see it by laying upside down on the floor of the airplane and looking up.  You must loosen that set screw to remove the yoke from the shaft.

You'll want to be careful turning the set screw.  It is easily broken, especially if someone put thread-locker on it to keep it from vibrating loose and allowing slop in the yoke.  The factory part is a hex-head screw, but sometimes it's replaced with a slotted or other-headed screw.  It's easy to mangle it.  If you mangle it, it's very difficult to drill out.  If it can't be drilled out, the only alternative is to wrench the yoke off the shaft by brute force, which leaves a scar on the shaft.  You can guess how I know all these things...

[Vance Harral]

Attached is the diagram from the IPC.  The set screw is item 11, it's an AN565-D416-H4.  You can read more about our struggles with it here.

 

 

[AndreiC]

@Vance HarralThat was very helpful, thanks. Yokes came out in 5 minutes flat, no stripped screws (mine are stainless steel).