As an owner of 6, 6"-blade cataract oars, all with protectors, I don't
believe the protectors would stay on a 5" blade. They are extremely tight
and difficult to get on a 6" blade, but they have come off in certain
situations. Even if they "seemed" to fit on the 5" blade, the plastic isn't
very flexible and the shape of the curve wouldn't adjust to the smaller
blade, so I think water would get under them and break the friction "seal"
that keeps them on. Sorry, hope this helps.
Answered on 3/26/2013 by Anonymous