I'm what the 10mm means. the bushing has vertical ridges (i'm not sure of the proper terminology). Is the 10mm the outside of the ridges, which would mean that I need to drill my hold slightly smaller. Or is 10 mm the the actual rounded part without the ridges that would mean that probally a 10mm hole would be good.
I thought some folks used a small amout of super glue to harden the wood. They treated the hole with superglue and then pressed on the bushing after the glue had hardened.