Next step, a metric shit-ton of sanding so as to be able to fit 5.1mm dowels into 4.75mm holes. Sanded inside the holes with roll of sandpaper on the handle of a modelling file:
...plus a bit of careful sanding of the dowels, trying to keep them as close to round as possible. After what felt like a week of sanding, and two blistered thumbs, they went in with encouragement from a mallet (I'd deliberately cut them a few mm long):
A spot of normal sanding, and they're done!
![]()