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For the benefit of some builders who are unaware of this...NAS1097 rivets
I had a couple of problem rivets (tough to access and buck single person) that I didn't seat well and required drilling out. After a couple of unsuccessful repeated attempts the rivet hole for a -3 rivet was too large. These particular rivets were in a dimpled layer of material. I knew I couldn't drill the enlarged hole to the next size and use a standard countersink rivet head in the dimpled hole sized for the original-3 rivet. The solution in this case was to use a NAS1097 rivet. They come in a variety of rivet size. After removing the messed up rivet, I updrilled to #30 (the next size up) and used a NAS1097-4xx which has a reduced size rivet head. It filled the original dimple nicely and with a second set of hands to help, I've got a nicely set rivet in a nice slightly upsized original hole. Happy, Happy! The picture shows the newly installed NAS1097. Hope this saves some worry and fretting over bad rivets. I have continued to learn that there are a variety of "fixes" out there, whether hardware or technique for just about anything with airplane building and repair.
NAS1097.jpg
I had a couple of problem rivets (tough to access and buck single person) that I didn't seat well and required drilling out. After a couple of unsuccessful repeated attempts the rivet hole for a -3 rivet was too large. These particular rivets were in a dimpled layer of material. I knew I couldn't drill the enlarged hole to the next size and use a standard countersink rivet head in the dimpled hole sized for the original-3 rivet. The solution in this case was to use a NAS1097 rivet. They come in a variety of rivet size. After removing the messed up rivet, I updrilled to #30 (the next size up) and used a NAS1097-4xx which has a reduced size rivet head. It filled the original dimple nicely and with a second set of hands to help, I've got a nicely set rivet in a nice slightly upsized original hole. Happy, Happy! The picture shows the newly installed NAS1097. Hope this saves some worry and fretting over bad rivets. I have continued to learn that there are a variety of "fixes" out there, whether hardware or technique for just about anything with airplane building and repair.
NAS1097.jpg
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