Mr Skelding does as Cosie mentione, but he places a 3mm spacer on the shock shaft so that it isn't fully compressed.
Yo can make a 3mm spacer by cutting a gap into a 3mm alloy or plastic spacer/shim, so that it can be taken off without having to remove the ball joint.
Apparently this gives the rightamount of rebound, which I think is 0deg or thereabouts.
Hope this helps.