Half round 10mm x 20mm wood mouldings

Just a thought. Get some dowel of suitable dimension and cut/plane/sand it to suit. Somewhat labour intensiive but end product should be satisfactory. hth, Nick.

Alas 10mm will be far harder to find than 1/2" (12mm) radius...

One option - but still a tad pricey if you only want 2.4m:

The man needs a router. Then you can spend your days looking for a

NT

If you can tolerate a slight shift in size, a section of 1" broom stick cut slightly off centre could yield a bit with the required 20mm cross section with just a slight loss of height.

You could drill a 20mm hole lengthwise through a 2.4m plank, then re-assemble the shavings to form a cylinder, using superglue. Then cut the cylinder in half longitudinally. Simple really.

Bill

I still can't work out what you mean there.

Another option is mount dowel in a drill and sand it down. Then cut in a bandsaw or table saw, with a piece atatched to stop it rotating

NT

Well if you cut a 25mm round in half you get two 25mm wide half round sections. Cut slightly left of centre and you get one bit smaller than the other. The smaller one could be 20mm wide, although slightly less than a true "half round"