The spacer sleeve bridges a visible gap when a carbon probe with a /UN end piece is used in an UN adapter. The spacer can be glued to the end of the probe to prevent loss. After being glued securely, the probe can only be used with UN adapters and can no longer be used with SUN adapters. This sleeve use is not functional it is fully aesthetic.

Note: Images and drawings are similar. Certain differences are caused by manual production or further development.