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Although I already had installed some rivets in the drive horn assemblies, this the first time I put together a finished piece.  Once this was riveted together it was ready to be attached to a wing.  So this was also the first time I experienced the joy of disassembly, deburr, dress all the edges and clean a large piece.  That’s a lot of holes to deburr and the pieces mostly get bigger from here.  The last picture shows the piece put back together and the area prepped for riveting.