I know some folks that used the 435 on the 6.0NA to furl the jib. When I had set out to do it on mine, I had purchased the 436 - just to be sure! If you use the 435 - make sure you have the hi-load bearings installed. I believe they're brown instead of greenish.

Note that while the furler is nice and convenient, unless you do some really creative rigging, you loose the ability to actively adjust the jib luff tension...which is not good for any kind of racing.