OK, so after repairing my isonic and stocked with the repair and performance of it, I discovered the vent plug leaks
I have been vacuuming the water out + using a wick & wind to get what I can from it.

Here is a photo, it seems there is no smooth surface for the o-ring to seal to. Any ideas on how to fix this? OR do I just add a new vent to the board like this one: chinooksailing.com/collections/board-building-part-accessories/products/1-board-vent-w-slot (I can get these in NZ. )