hi!! i also have a pse viper, bought it at walmart 3 or 4 years ago, i wasn"t really looking for a crossbow at the time but it was on clearance for $99, couldn't pass it up. i started shooting a little with it last year & i had trouble with the safety jammin up on it. i tore it apart & a pin was laying loose in the rail, for the life of me i can't find where it goes. when i pulled the trigger assembly out the pins were set in so loose it literally fell apart, can you get me that e-mail address also because i would like to purchase the entire assembly thanks for your response!!
The Wal-Mart version of those bows were produced with inferior pot metal trigger/safety components, plastic scope rails and brittle stocks. They are easy to distinguish from the pro shop models by their very dark camo pattern. and overall toy-ish feel. The pro shop models are much more substantial and have stainless trigger/safety components and a beefier stock. When at Wal-Mart.... caveat emptor!
Take it to a PSE pro shop or send it to PSE to be repaired with "the good stuff".
The "elevation thingy" is a simple cam that, when rotated, will increase the angle of the scope rail relative to the track, thus compensating for trajectory. It's primary use is to coarse-set a scope's upper crosshair or dot for 20 yards with fine adjustments made with the scope's turret adjusters. Those using a single-line scope or single dot, can use additional incremental clicks to increase the range setting. However, the actual range will be very arbitrary and you may have to experiment to see which click equals which yardage for your setup. It's exactly like Horton's "Dial-a-range", but with far fewer parts.
Trying to use this adjustment with pin sights is a waste of time. Rely on your pieep and pins in a fixed configuration.
I also just picked up a used Viper Copperhead and Viper Python. Have been looking for manuals as well, to no avail.
I think i have figured out how to sight it in(elevation on 1, zero at ~20 yds, then more elevation at longer range), but i want to rebuild the trigger and sear mechanism and try to shim some of the slop out