We've spliced on Harken T-18 carbo blocks, one of them has an eye splice on on end and is luggage tagged to the boom cleat. The other is spliced to the line that runs to the clew and the cleated control line.
The Clew Purchase
As you can see the tail end of the non-cleated outhaul line is spliced around the end of the boom. This allows much easier rigging while also reducing friction compared to a system that is tied around the fairlead.
What did we use?
How Long Are The Laser Outhaul Lines?
-The Cleated Line is 14ft or ~4m
-The Non-Cleated Line is 5ft or ~1.5m
-The lines are also attached with 7/64" Samson Dyneema, so about 2ft extra is needed to splice the clew block and create the luggage tags