content_image/523522.jpg
<img src='content_image/523522.jpg'>

3. Remove the head by breaking it off. Use a punch as a lever. 

4. Punch out the shank. Use a suitabl backup, preferably wood (or equivalent), or a dedicated backup block. If the shank does not come out easily, use a small drill and drill through the shank. Be careful not to elongate the hole. 

## Replacing Rivets 

Replace rivets with those of the same size and strength whenever possible. If the rivet hole becomes enlarged, deformed, or otherwise damaged, drill or ream the hole for the next larger size rivet. Do not replace a rivet with type having lower strength properties, unless the lower strength 

is adequately compensated by an increase in size or a greater number of rivets. It is acceptable to replace 2017 rivets of 3 ⁄ 16-inch diameter or less, and 2024 rivets of 5 ⁄ 32-inch diameter or less with 2117 rivets for general repairs, provided the replacement rivets are 1 ⁄ 32-inch greater in diameter than the rivets they replace. 

## National Advisory Committee for Aeronautics (NACA) Method of Double Flush Riveting 

A rivet installation technique known as the National Advisory Committee for Aeronautics (NACA) method has primary applications in fuel tank areas. [Figure 4-99]  To make a NACA rivet installation, the shank is upset into a 82° countersink. In driving, the gun may be used on either the 

