Instructions for Selecting Rivet Sets:
To develop maximum power, the riveter must drive the rivet near the end of the riveter's stroke.For maximum power the combined length of the two rivet sets must be of the correct length. Determine the correct length as follows:

WHEN TWO CUPPED RIVET SETS ARE USED: The sum of the two rivet sets "L" dimension should equal the closed height dimension of the yoke minus the total thickness of the material being used.

WHEN TWO FLUSH SETS ARE USED: The sum of the two rivet sets "L" dimension should equal the closed height dimesion of the yoke minus the overall length of the rivet after it is driven.

WHEN ONE CUPPED SET & ONE FLUSH SET ARE USED: The sum of the two rivet sets "L" dimension should equal the closed height dimension of the yoke minus the total thickness fo the material being riveted and the height fo the finished rivet head driven by the flush set. If necessary, select rivet sets a little short and shim to proper length with hardened shims listed in the table. The closed height dimension of the yoke referred to above is the opening available when jaws of plunger are in extreme closed or forward position with both rivet sets in place. 

Note: To determine correct set when ordering, select rivet size then body length.