Nick wrote:


Mine has
two jaws and that is OK for the small amount I use it. For long rivets I
have to press the handles together twice.

In that case, the rivets must be too long. To judge how long the rivet
shank should be, take the thickens you are riveting and add just a
little over (10%) the diameter of the rivet to the length. That way, you
get a good rivet set.

I have never encountered a three jaw gun in the aerospace industry, so I
can't comment on them.

Dave