See here
for why I'm redoing my horizontal stab. I will only post new
information relating to this part of the build. If you're interested in
my documentation on the original stab, see here for all of those posts.
These are not easy rivets to buck. Stories abound on experiences with these as they are shared among several of Van's models.
A bucking bar with a nice 8.5 degree angled face would do the trick as you could just push it up against the rib and keep everything flat, as this properly cut block of wood suggests.
However, a fellow -14 builder loaned me this great bucking bar for the purpose (sorry, I don't know who sells it). It lines up well enough to be usable. You can compare it to the ideally shaped bar represented by the wood block.
Using the 10.5" straight rivet set, the rivets could be accessed well enough. It just took a lot of hits at nearly 100 psi (keep in mind that the length of that set will absorb a lot of energy in the form of compression). The below shows the right side. A mild smiley on one manufactured head that is acceptable per the mil-spec (left), MIL-STD-403, 5.2.7.5. The shop heads aren't the best, but they are certainly acceptable. Some spot priming is obviously necessary too after some bucking bar scrapes.
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