I encountered a few issues at this stage mainly due to (what I deduced as) the skin not being perfectly aligned with the rib flanges and as a result, the rivets being set bent over during the process.
One in particular failed so many times, I had to replaced it with an 'oops' rivet as the hole was too enlarged for an AD3 rivet. This rivet was a leading edge rivet where I couldn't manipulate the rib at all to align any better.
Below are some photos of the Horizontal Stabiliser(HS) skins being clecoed ready for riveting...

One in particular failed so many times, I had to replaced it with an 'oops' rivet as the hole was too enlarged for an AD3 rivet. This rivet was a leading edge rivet where I couldn't manipulate the rib at all to align any better.
Below are some photos of the Horizontal Stabiliser(HS) skins being clecoed ready for riveting...
It never gets old seeing almost a whole skin with completed rivets
All rivets just below the HS-914 Stringers had to be set sight unseen due to the limited distance between the ribs and skins.
Luckily, I've had a chance to rivet quite a few of these little suckers now and I've got a good feeling for it.