dear Fernando
impossible that there was a method to screw-unscrew the barrel. The tool was a cylinder that was 4 8 and more rarely three projections, slightly inclined (according to inclination of stretch marks) that fit into the grooves. Soi fixed you in the striped, at position 5 or 10 minutes, you will see a groove a little older, deformed
I just need to know that number of flutes
Afectuosamenre. Fernando K
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