I just installed UCRs on my HH Exped last night. If you want to use Whoopie Slings just leave the dead eye off end run that end through the HH like the stock line runs and make the adjustable loop on the other end like you normally would. Very easy to do, just do one end at a time so if you forget you can look at the other end for guidance.
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Thanks Scott. The sailor in me just needed to do it right.
Javaman - The prussics do have some trouble with the Amsteel. One way to get more bite is to change out the line between the hooks to something thinner. I believe the general rule is the prussic line should be half the diameter of the line it's used on so go smaller than that and maybe get even more holding power.
Hogn8r - That's how I did my original whoopies and it works just fine but I just wanted to neaten it up.