Hi Oli,
The double block is the 30mm. Although there are no restrictions on blocks (
See class rule 3(i), the floating double block in the cascade will be the 30mm.
The cleat will be a Ronstan Medium cleat
From Rooster
You will also need a top fairled for it.
Downhaul is made of 19mm ish blocks.
See pics here...
The ISO doesn't have a need for a forestay, so remove it from the mast as it can be a snagging risk. To help stablise the mast on the shore, use a rop attached to the jib halyard and pull a little tension on it.
The jib tack attaches direct to the space frame See pic of 1013's bow:
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(The two bits of black rope on the left of the spinnaker chute mouth, are painter rope that is attached to the trolley.) When taking jib off, untie the tack line else you will force a crease into the jib when the wire naturally twists as you roll the jib.
Mainsheet - 8mm diameter NO BIGGER, and about 8.5 meters.
Rope guide here.... It needs to be long enough so that when the boom is on the shroud, you can comfortably stand up in the middle of the boatd and hold the end of the mainsheet. (Yes we stand up a lot in the ISO - we don't do crawling around.)
When ordering from Rooster, please come to the ISO site first, then click on the Rooster logo on the bottom of the left nav bar. This way, the ISO Class gets a little bit of commission. :)