I just ordered my first new bow sight in about ten years. I bought a Truglo single pin that has the adjustable slide on it. It came with four screws in the package, two short and two long , as well as, two 1/2 inch thick washers. What do I use all these screws and washers for? I thought it would just come with two screws that I would attach to the riser. Isn't anything simple anymore. Can someone tell me the correct way to mount this darn thing?