The ailerons had a significant amount of play when I acquired the airplane.  Upon inspection this was found to be due to sloppiness in the bushings in the aileron pushrod linkage.  These bushings, along with the aileron hinge bearing bushings, needed replacement.  Once new bushings were installed the aileron sloppiness was pretty much taken out.

While reassembling the ailerons I also noticed that the aileron counterweights were extremely sloppy and could move about plus or minus five degrees up or down relative to the aileron, and worse the counterweights were hitting the upper wing skin within the counterweight slot cut into the wing when the aileron was at down travel.  Closer inspection revealed two problems.

The counterweight is secured to the aileron with two fasteners.  One is the aileron hinge bolt, which goes through the counterweight bracket as well as the hinge, and a second screw secures the counterweight relative to the aileron.  The screw must be countersunk because of the proximity to the aileron hinge bracket.  Unfortunately the screw that was previously installed was a plain threaded screw, so the fit in the counterweight bracket hole was very sloppy.  Drilling the hole oversize and replacing with a NAS #10 screw with an unthreaded shank solved the sloppiness.

The counterweights move within a slot cut into the bottom wing skin and when the aileron is a neutral travel the counterweights are flush with the lower wing skin.  When the aileron is at full down travel the counterweight protrudes upward into the wing slot.  The counterweight brackets have a slight bend to them which makes the counterweights be left handed and right handed units, but you can install them backwards and still have them fit the slot.  Unfortunately when installed backwards the counterweight hits the upper wing skin inside of the wing slot before the aileron achieves full down travel.  After verifying that the counterweights were identical in mass, swapping them left to right fixed the aileron travel limitation.