So, Nicopress sleeves seem to be another of these aviation grey areas.... Thanks for your answers; this is a summary of the information I received.
1- The type of Nicopress to use depend on which cable you are using: stainless steel or galvanized; 2 - The common practice in the homebuilder's world seems to be to use copper on galvanized, and zinc-plated on stainless steel. 3 - However, the experts at the Nicopress manufacturing company say only stainless steel or tin plated sleeves should be used on stainless steel cables. 4 - The only trouble is Aircraft Spruce does not stock these. My cables will be stainless steel, so if I remember the galvanic corrosion rules right, I guess the zinc plated ones are likely to give me less galvanic corrosion than the plain copper ones. Am I right? Anyway, I will cover the Nicopress swages with transparent heat-shrink sleeves, so I would be very surprised if anything nasty happens without warning! Serge Vidal KR2 "Kilimanjaro Cloud" Paris, France