Machine for manufacturing disks on a rod

In a machine for manufacturing disks on a very long rod, said machine including two conveyor-driven chains of moulding units that press against one another and receive said rod therebetween in an area provided within abutting mating moulding units of said two chains with at least one orifice for injecting a mouldable substance into a cavity formed between a pair of mating units, one from each chain, the units then parting to release a disk-shaped part moulded onto said very long rod, the improvement wherein at least one of the chains of moulding units has at least one so-called "hermaphrodite" moulding unit with leading tabs and trailing tabs for fixing to its adjacent units, the gap between its leading tabs being different from the gap between its trailing tabs, and these two gaps being such that they allow said "hermaphrodite" unit to be inserted between a "female" unit with a wide gap between its tabs and a "male" unit with a narrow gap between its tabs or between two other, like, hermaphrodite units.