Bow roller: if you lacked a bow roller, what would be the point at which the rode went from going sideways from the windlass, to downward into the water? You don't want it to just hang out over the gunwales Windlasses are usually mounted on the deck, you know.
I don't have a windlass, but I understand that at least some of them have a chain portion (toothy) and a rope portion (smooth like a winch drum). I'm not sure how you make sure that it switches from one to the other appropriately. It may require that you go forward.
Very little of the rode stays on the drum. Just as with winch drums, the tail of the line goes someplace else and only a few coils stay on the drum at the time. In the case of the windlass, the rode and chain should be redirected to a locker somewhere belowdecks.
s/v Laelia - 1978 Pearson 365 ketch
s/v Essorant - 1972 Catalina 27