After the this feedback of my first Bend Spiral Bowl I started to research for an improvement that would make the built easier. It took me a darn whole day and several prototype to realize, that it couldn't be easier than this: after breaking the spiral arms several time I started to water the wood and heat it up in the microwave oven. As last time I used a suitable bowl to bend the arms into position. Now I discovered that you don't even need those brackets. When cooled and dried the arms stay in position and just a little drop of woodglue secures them completely.
My build was done on a desktop cnc-machine by Stepcraft from 6 mm birch plywood using a spiral-toothed 1.2 mm flute.
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