Each parallel shelf pin (PSP) has a spring that slips over the spline. Insert
the spline into the Parallel Rod on each end. The shelf pin compresses into
the Parallel Rod allowing the rod to fit snugly between the interior casework sidewalls.
To install a Parallel Rod into interior casework, fit the spring onto the spline of the PSP and insert it into the ends of the Parallel Rods. Insert one end of the rod into a 5 mm shelf hole, then push the rod against the side wall to compress the spring. At the same time, compress the other PSP by hand while you align the opposite shelf pin hole, releasing the pressure as the hardware pin springs expand against the casework sidewalls. The Parallel Rod is now securely held into place.