Lorica Segmentata Girdle Plates problem

[Hibernicus]

Punch the rivet out the way it came in... kind of like backing it out.

Scoring the peened end with a chisel makes it easier. Score deep.

If the peening is not broad or deep you may not need to score the peened end. After you do this about a gajillion times you quickly recognize which rivets need scoring and which will punch out with minimal effort.

ALSO.... you may be able to cut off the head of the rivet (not the peened end) with a flush cut end snip.. sometimes called "hoof nipper" "nail snip" "nail nipper"

somethingl ike this:
http://www.nordicforgeinc.com/images/15_in._Nipper.JPG

I like one with a very shallow camber (angle of the blade)

If you haven't over peened your rivet and crushed the strap there should be some play between the rivet head and the strap. This is often enough room to force the nail nipper between the strap and rivet head in order to cut off the rivet head.

Sometimes you can use the same tool to cut off the peened end making easier to drive the rivet back out the hole.

If you manage to enlarge the riveting hole you can make it smaller with the peen end of a small ballpeen hammer by gently hammering around the hole. This drives metal into the hole making it smaller in diameter.