I have been using my Nib Creaper for almost a year now and I have begun to notice that my piston seal is starting to crack so I need to get it replaced. However I don't know the size o-ring to use to get it replaced and getting them from Goulet Pens is not an option as the shipping to fee to get them shipped to Malaysia is like 20$(80MYR). Any one know what size o-rings they are?