I do a l lot of compound cutting for my bar-hopping fundraising. I suspect that here in the US the compound cutting scrollers use 2X2 studs.
(Actual size is 1.5 X 1.5") I have found that Home Depot has a 2X2 labeled "Select Pine". It is usually located near the craft wood display.
It is a tight, knot free, clear stud and great for compound cutting.
I use the scrap sides from compound cutting. I cut them as flat as I can and give them to preschool and kindergarten classes.
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