Stemball Terminals
Common on imported vessels and some newer production US built boats. Used on the upper ends of shrouds and backstays and some headstays without furling systems. Fitting sits in a SS cup which in turns rests in an aluminum socket in the masthead or spreader base. Smaller diameter rigging installed in some places on larger masts may require a double set of cups.
When replacing rigging insure that the proper set of cups are in place in the mast receptacles. Swage studs will pass through the cups but eyes, forks, insulators, and installed Sta-Lok terminals will not.