ORIGINAL: hallj86

Your best option is to throw that in the garbage and get one without a tube it slows your bow and causes a lot of vibration. You can get ones for the same price as the kind you have with alot better accurcey. You have to balance the size though too small you wont be able to see through it when in low light. Too big and you wont be verry accurate because you have a lot more room to center your pin in.