I live near Portland Oregon USA. Where can I buy metric Forstner bits to accommodate the standard sized brush knots. I prefer on-line shopping but a "brick and mortar" store is also good.
(I switched to wet shaving with a DE razor in part to save money. I can't afford to save any more )
I use standards mostly. The only metric I bought was 30mm. A 24mm knot fits perfectly in a 1" hole, for example. Typically your gonna set them deeper than the plug so it's gonna need to be wider.