2 pcs. of wood 50 x 22mm dark wood, I use black walnut
Wood 50 x 4mm for the middle piece, I use sycamore
First put the 3 pieces together, the bright colored wood in center and glue it together. This gives you a piece of 50 x 50mm. Mark the center and the offcenters at both sides. The offcenters are 14mm away from the center in both directions. (look at the PDF Plan)
Turning eccentric
Turning round
Excentric turning part1
Excentric turning part2
finished
Now sand the whole thing that everything is smooth