Chris,

I did that on my 17 - used the smaller block on the boom and the larger Ratchamatic block on the traveller. It's an awesome setup for that boat since you have to let out a bunch of sheet in a tack. The sheet itself is 5/16 Marlow Excel Marstron - similar to Yale Light, but not as durable and way less expensive. I think the line cost all of $18.

Anyway, I'm going to try that setup on the 16 this weekend. I sold the 16's main system (stock line w/ regular Harkens)with the 17. I'll let you know how it works, but I've already got a pretty good idea.

Matt