Really annoying when that happens Ken, I throw my NP uphaul rope (mega knot) away after doing the same thing as you. I got a cheap uphaul with a smaller knot.
On my current and past formula boards, I usually just put 1 x thin layer of glass matt over the affected area, if you keep it thin, it blends in pretty well as you can still see the wood through it.
Alternatively, drill a 3mm hole and inject "slow drying" epoxy resin into it.
Im sure you will know about http://www.boardlady.com/index.htm
great for pointers, but Im not sure why "he" calls him self "boardlady"