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FormulaNova said..
If you get a triple block (harken block) from whitworths, they have bearings in them and the downhaul almost does itself. You have to attach it with a d-schackle though.
+1 for this if you can mount the block high enough, I put one on a KA where the pulley exploded mid jump. With the harken pulley was so easy just downhaul by hand, no tools or tying bowlines required.