Dogtra RRD - Manual (Page 14)

1) The bird launcher is shipped with the
springs adjusted in the bottom setting.
This setting gives you the high launch.
Turning clockwise, move the springs
down for a high launch (Figure 9). : the
very bottom being highest.
Figure 9. Positioned for high launch
ADJUSTING
SPRING STRENGTH SETTINGS
2) Turning counter-clockwise, move the
springs up for a low launch (Figure 10) :
the very top being lowest.
Figure 10. Positioned for quiet launch