Are the port and starboard daggerboards on the Infusion interchangeable? They both seem to work on either side of the boat.

Also, mine aren't staying up - they're sliding most of the way down. Anyone else having that problem?

To keep them up, you can do one of three things - tighten the screws on the rubber stopper, which squeezes it and increases it's width, thereby holding the board better; you can replace the stopper if yours has begun to break down, or you can install another stopper on the opposite side of the boardwell, thereby giving you two stoppers to hold up each board. I've done all three and they work equally well.

Thanks John - and I'm assuming that the boards are identical and can be used on either side of the boat?

Every Infusion skipper I sailed with had them marked "port" and "starboard." I honestly don't think it mattered... don't ask me how I know.

AFAIK the F18 rules mandate that boards profiles be symmetrical.

The reason for the marking is that one board will fit worse in one side than the other. Maybe it is a mm thicker and just has a harder time up and down. I mark mine and I can put them opposite but it is better when they stay on similar sides.

The Capricorn may never know if they have a strap in place for lifting they have to put them in on the same side each time to use the lifting strap.

A bit off topic... Does anybody have any suggestions on what can be used as a replacement for those rubber stopper pieces that go into the top of the daggerboard wells? The infusion I sail on is missing a stopper on one side, so the board slides down. It just seems to be a stiff piece of rubber, but I haven't come across anything that seems suitable to use as a replacement.

Seems like a piece of one of those white resin squeegees would do it. something like this: