I've been reading in another thread about lighted nocks. I was enlightened in one post that there are these types of nocks: flat, half-moon, capture, snap-on & omni. Are these universal to all xbows? My Ripper package came with half-moon nocks so that is what I specified when ordering arrows & lights. Would any of these different types of nocks be okay for my Ripper? Do certain xbows require special nocks or only one type? Any advantage of one type over the other?