Pin?

A screw, as show
Most of those shells haven't got a threaded hole (well, all the ones I have handled), a screw could not be fitted to non-bluewave shells (not sure Bluewave shells represent >1% of total installed ones).
Also, when the wire is tensioned the shell takes its seat against the hole in the mast wall and sometimes rivets are broken, I would not want to have anything preventing the shell to take a correct position, or adding unnecessary stress if the screw is not perfectly aligned. Anyway, it's not my mast :)
 
Will the fitting fit through the opening in the mast in which it sits, or does it have to be manipulated out through the end of the mast?
On one side you have the wire with a swaged stemball terminal going through the hole in the shell, on the other an oblong hole in the mast wall. Twist the shell until it can be fed inside the hole in the mast with its shorter side; once inside the mast, turn the shell upright until it fits against the wall. Put a rivet in the tiny hole.
The only purpose of the rivet is to keep the shell in the right place while the crane lifts the mast and all stays and shrouds are loose (except if discontinuous rigging), once all wires are tensioned the rivet becomes useless and it often breaks/drops.
I find it a very practical attachment, I had to change my lower shrouds with the mast up and it was simply a matter to get at their height, twist the shell and take the shroud end off (instead of playing with cotter pins/rings, pins etc with the risk of losing pieces); when fitting them back, the wire weight was enough to keep the shell in the correct position.

ps the split pin in your picture is useless wrt rigging; either it has some other use (very difficult to figure out) or you could remove it.
 
On one side you have the wire with a swaged stemball terminal going through the hole in the shell, on the other an oblong hole in the mast wall. Twist the shell until it can be fed inside the hole in the mast with its shorter side; once inside the mast, turn the shell upright until it fits against the wall. Put a rivet in the tiny hole.
The only purpose of the rivet is to keep the shell in the right place while the crane lifts the mast and all stays and shrouds are loose (except if discontinuous rigging), once all wires are tensioned the rivet becomes useless and it often breaks/drops.
I find it a very practical attachment, I had to change my lower shrouds with the mast up and it was simply a matter to get at their height, twist the shell and take the shroud end off (instead of playing with cotter pins/rings, pins etc with the risk of losing pieces); when fitting them back, the wire weight was enough to keep the shell in the correct position.

ps the split pin in your picture is useless wrt rigging; either it has some other use (very difficult to figure out) or you could remove it.
Thanks, That's useful info.

I'll try and have a look inside with a snake camera just to see what's going on before attempting any disassembly.

I'll report back.
 
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