I've just got done flying my UCD.46 for the first time. Before flying I changed my control hardware to 4-40 size all around. Sullivan wire horns, 4-40 clevises and push rods, larger control arms for my Futaba 9202, 9201 servos, sealed hinge lines with monokote strips (a pain with all of those color changes). Lastly I made sure that I had a 4-40 nut on each pushrod end that had a threaded clevis. I noticed when checking everything over that one aileron flexed more than the other. It was because I hadn't tightened one of those nuts down enough. Made a difference.

No flutter for the first couple of flights using an OS.91 with a 15x4W prop. I made sure I was not high on the throttle in anything but UP.