I have removed 7 bronze piston hanks and 11 slides from some old sails. The boat has now been sold so no more need; I suspect they are the originals from my 1960 Miller Fifer. Will swap for a decent bottle of malt! They can be collected from my office in Stirling or I can hand over at Ardfern at a weekend. All the pistons work, i.e., they're not seized but could do with a clean-up to remove salt deposits and mild green corrosion.
I would prefer to 'sell' them to someone who has a classic boat and actually wants to use them - otherwise I'd have put them on eBay myself!