Spool Yo Yo Tree
220, 210, 200, 190, 180, 170, 160, 150, 140, 130, 120, 110, 100, 90, 80, 70, 60, 50...Those are the measurements for the 18 templates.
Spool Yo Yo Tree
If you set your compass at 11 cm (1/2 of the 22cm) and make the largest circle, then go down in 5mm increments (you will actually be reducing the circles by 10mm each time). So you would use the following settings on your compass: 11cm, 10.5, 10, 9.5, 9.0, 8...