Pin and Cotter
An arrangement for pinning flasks, consisting of a wrought iron or steel pin, with forged or turned shoulder, to rest in holes provided in the drag, to which it is made fast by a nut which is screwed on the small end of the pin. The cotter-hole is forged in the pin, so that when the cotter is driven home its upper edge touches the upper part of the hole, while the lower one rests on the lug or flange of the cope, and clear of the hole entirely; thus by this means drawing cope and nowel close together and holding them. See SNUG.