Four-Sided Spine Rounding Form (Rundeholz) for Bookbinders

Spine-former used to create curved spines of books with four grooves of the following diameters:
– 30 mm (1 1/8")
– 25 mm (1")
– 20 mm (3/4")
– 16 mm (5/8")

Full list of diameters you can choose from (please PM any changes in the tool design I should account for):
– 50 mm (2")
– 40 mm (1 1/2")
– 36 mm (1 3/8")
– 32 mm (1 1/4")
– 30 mm (1 1/8")
– 25 mm (1")
– 20 mm (3/4")
– 16 mm (5/8")
– 12 mm (1/2")

This spine rounding form is made from laminated oak or beech beam.

All measurements are made in mm and sizes in inches are approximate.