I used to use a Ronstan upper swivel and a Hobie 18 style lower drum furler on a tornado. Worked good for many years in many high wind conditions and high rig loads (side stays loaded pretty good and 8:1 mainsheet tension to the max).

I even worked out a sweet jib luff tension that worked through the lower drum. Here are some pics:

Jib Luff Tension #1

Jib Luff Tension #2

In this shot, look to the lower right of the pic on the mainbeam...there is a 3:1 purchase micro cleat...doubles the 2:1 at the drum for 6:1 total.

Luff Tensioner Adjuster

Mike.