I have an old Hood 810 LD continuous loop furler that works OK, but its time to replace the line and some of the double blocks that control the furling line. I'd like to replace it with a single-line furler, but Hood doesn't offer an upgrade option any more. There are a few Seafurl 5 drum units available right now, and it looks like they might just swap out with my current drum - it looks, from pictures, like the foils are about the same. Anyone know if the foils are compatible between these two units?