You can source quartersawn European beech at this site, https://www.inventory.horizonwood.com/set-detail/beech/lumber/391630. You can get a smoother...
Score it with a knife, take it out and plane it. Alternatively, plane it in place (provided there's no risk of hitting the metal). Take thin shavings...
Since it's ready to assemble, I'd use a couple of brass slotted round head screws in the middle, clock them to make them look interesting, no glue.
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I wouldn't take the chisels to the grinder, try to determine what angle it came from the factory. If it's close to 25 degrees, just use whatever that...
If you are a beginner, get a Bailey or Bedrock plane. The extra features are interesting but won't perform any better than a well set up bench plane....
We were shopping at a store in New England and I noticed an old display cabinet, unused. The top used splines in the mitered joints. One side looked...
I don't think this notion of stressed/non-stressed categories is an assurance of the longevity of a piece of furniture. Accidents happen, moving one...