In my never-ending quest for bowtuning knowledge and the best arrow flight I thought of a question last night. I have a golden key shoot thru rest. It has a knob on the side to adjust the spring tension on the prong rests. It makes them harder or easier to push down. I just realized that in 5 years of bowhunting that I have no idea why that spring tention is there and why it's adjustable. What does it do and when would I want to adjust spring tension up or down? Thanks!