Velocity Adjustment:-
Velocity adjustments determined
by the differential spring tension on relevant hammer and exhaust valve.
To simplify, the spring tension behind the hammer striking the exhaust
valve and opening the valve, allows a gas burst to blow the ball out through
the barrel. So, more spring tension behind the hammer will give bigger
burst and therefore higher velocity. By changing this spring with one of
less tension it will lower the velocity.
In the past days of the Sterling, it was quite a common practice to "clip" a coil off of the spring to shorten it, thus creating less tension. Also, shim washers were used and placed in the hammer to "pack out" the spring creating more tension. The idea being to use a spring which allowed a range of adjustment, simply by adding or removing washers. A selection of springs will be available shortly in a spring kit from Arrow Precision.
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