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Would I be right in assuming that the nicopress sleeve 8063501 is used to fasten the sail to the chosen end thimble.
The nicropress sleeve is not used for connection of a sail to anything...
For wire construction, a nicropress sleeve is slid onto the wire, the wire warps around the thimble and then back through the sleeve. This is then cinched up tight to the thimble and crushed (compressed) by tool to make a permanent loop in the wire.
When new, a nicropress sleeve looks a bit like a short double barrel from a shotgun.