If boats surge forward at anchor in rough weather, large side loads can be imposed on their stemhead rollers. Weak side cheeks can bend, but a nut and bolt across the gap helps spread the load between the two sides.
Some simple locking pins can be rolled and released if a mooring line or anchor rode rubs back and forth against them. A chain rode in particular must be kept in its roller, because chain can cut right into a boat if it gets loose.
A pawl on the roller will stop the chain running out, so you can rest while hauling it in. A counterweight, or bit of bungee cord, will keep the pawl in contact with the chain.
A simple notched plate can also be used to secure the chain to give you a breather.
Strong side rollers protect against chafe.
This extended bow roller augments the original one, so the anchor misses the stem and self-stows. The thick stainless bars welded on the edges reduce chafe and strengthen the sides.
The notched plate, welded between the sides, will hold the chain while hauling in.
A second roller at the rear of the fixture running over the rode helps to tip the anchor clear of the stem and creates a better lead into the windlass.
There are many types of tipping rollers to help anchors self-stow.
Large boats often need a second large anchor to keep them safe in remote anchorages, but anchor width can make it hard to stow two anchors in side-by-side bow rollers. This design has one roller slightly ahead of the other so the two anchors don’t quarrel. Note the hefty anti-chafe pad on the stem underneath.
Illustrations by dickeveritt.com