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plane board
I had one made at an upholstery shop out of marine vinyl over heavy foam. I think it was $85. It's held up well. Any decent car upholstery shop could do it.
Picture a right angle triangle (a2+b2=c2).
The a2 part is fixed at 14.5" and the shaft plane c2 is 20". b2 is adjustable for different lie angles.
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