6.1.6 Supporting Ring, of oil resistant plastics or other
suitable non-metallic, non-absorbent, oil-resistant material,
used to suspend the jacket (see 6.1.3) in a stable and upright
position in the cooling bath and to provide a concentric
location for the stopper (see 6.1.7). A design is shown in Fig.
4 for guidance, but this design may be modified to suit the
cooling bath.