I assembled a set of those knives with stabilized maple burl as a gift. Unfortunately I forget the pin size I used. I'm pretty sure I just bought pin stock that matched the existing holes rather than reaming out anything bigger. I also finished with Tru Oil and from what I gather from the recipients, they are still holding up well several years later. I did warn them to wash with care and to never use the dishwasher.
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If you want to go *really* durable, you could go the route I did on this CA-coated paring knife stabilized maple burl handle (used a cheap AliExpress knife blank to play around with)...
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Feels like plastic in the hand, but it sure does make the wood shine! Haha