Hi, I've purchased a 3 step handrail for my Morryde steps, I have a 4 step model, didn't really know there was 2, wondering if it has to go on the bottom step or not, also am I supposed to drill right through the stringer part to put them on, just wondering if this is the case why wouldn't they give me long enough bolts, now I can get longer bolts no problem but I am just wondering.