The firewall has been sealed on to the lower fuse skins and muffler shrouds.
After I sealed everything together, I realized I neglected to rivet the F-01435-L/R cover bases to the F-01451-L/R tunnel sides. There are 2 rivets on each side that need to be set before attaching everything to the F-01483-L/R forward bottom skins. If they aren't done prior to that point, then there won't be access to the inboard side of the tunnel sides since the F-01453-L/R muffler shroud sides would be in the way. See red areas below from page 28-05.
Figuring I'd have to use a pull rivet of some kind, I researched my options. I found that there are no strong 3/32" pull rivets available. The best I found was the CCC-32, which has relatively poor strength. So, I thought I might be able to uncleco the tunnel sides to access the rivets. Sure enough, it was possible. With some wood blocks to push the sides away from the muffler shroud, I could easily negotiate a squeezer in there. Crisis averted.
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