I fitted small plates to either side of the base which are screwed into the sides of the rocker base and go about half way up the trunions. I've got some pics in a thread somewhere - cannot find them now (*). This has substantially reduced the sideways movement but does little for the flexing of the base. I'm working on solving that. Remember the joke - keep the tyres and change the car? I plan to keep the 12" mirror and change just about everything else - working on it!
*Edit:- OK, for those interested, there is information in this thread and other threads referenced there:-
http://www.iceinspace.com.au/forum/s...59&postcount=2