Posted for "Mark R Steitle" <mark.steitle@austin.utexas.edu>:

 Wally,
 I bought a set of the rudder gears, had them bored to proper ID and
 installed them on my ES.  It has been a while and I would have to search
 through my records to find the source.  Anyone with a lathe should be
 able to bore them out for a small fee.  You will also need to
 cross-drill for a locking bolt to keep them from slipping.
 
 Mark S.