The rudder guides are installed in the aft fuselage. The plans call for AACQ4-4 rivets backed by NAS1149FN416P (a.k.a., AN960-4L) washers. There are two parts to the rudder cable guides and their thicknesses differ. Below are the left cable guides.
On the smaller cable guide (F-01497B), the pull rivet retained a significant length of the mandrel. Must be related to the thickness of the guide as the right side (not shown) did the same. The AACQ4-4 rivet has a grip length of 0.126-0.250.
The rivet is a "Q Rivet" with a special interference mandrel (brochure here). You can watch this fun animation showing how it's supposed to work.. I'm guessing I'll have to pull those two rivets out and stack some more washers to get the thickness within the grip length.
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