I have a Lynx 4 arrow quiver and was putting it on my new bow today. I forgot that on my old bow I had it on, it had a small, square piece of rubber to go between the sight and the locking quiver bracket. Is this a vital piece and what does it do? i have it on right now but I hate how it kind of curls a little bit between the sight and bracket. Does it absorb shock or something? Just wondering if it is something I really need on or not....Thanks!