Even the simple elements of rivets and bolts have produced immense developments since the days when bolts were made by hand, holes cored or hand-drilled, and rivets formed and closed by hand labour.
Nails, rivets, chains, fire-irons, locks and safes are produced.
Blind rivets have been developed to solve both of these shortcomings.
Also check the connecting points of the faceguard and chinstrap, where the rivets or snaps may have come off.
It is found in practice that the stresses on the several members do not differ sensibly whether these members are pinned together with a single pin or more rigidly jointed by several bolts or rivets.