The Nub is essentially a lower friction (17%
less apparently), lighter (at 16g), stronger (4.5 ton breaking load)
friction ring, in plastic instead of alloy. ‘Racing,’ you say. And you’d
be right, but a cruiser would be wise to carry a couple of these
onboard. Let’s say your main halyard turning block breaks, or a cruising
chute turning block. You can either drop the sail and unreeve the
halyard or sheet as far as the failed block then put another block on,
or you can put this over the halyard or sheet and secure to the padeye
with a Dyneema loop. A quick fix that could save a ton of money.
Race boats also use them for cascading
backstays, lazyjacks – pretty much anywhere.
Suitable for 10mm running rigging or 12mm