I was at this stage on my ailerons; where the outboard rib gets riveted to the spar. As noted in the thread there is not a lot of room here.
I modified my angle rivet set by grinding a bit off the side. This allowed the head of the rivet set to sit squarely on the the rivet. The rivets were easy to drive this way with nice visible factory heads. A long rivet set would have likely worked ok but I do not have one and after all these years of not needed one I was reluctant to purchase one for this minor job.
Note that when using an offset rivet set I always use electrician's tape to hold the set in place. This keeps the set from turning in the gun as you drive the rivet.

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Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger
Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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