On a Rollei TLR, where the winding crank is hinged, there are two small pieces of plastic or phenolic or something that press against the crank handle hinge and prevent it from flopping around. There is a spring washer underneath them to apply this pressure. When I disassembled my Rolleiwide these "corks" as Rollei called them, fell to pieces. They are approximately .024 inch thick and are dark brown. On my 3.5F they are light brown. Does anyone know of a suitable material or replacement for these? Allan