Hi Doug,
I never dared to dismantle a drummag. When I started collecting, the first one I bought came in with the message of the former owner: 'Do Not Ever Try To Open It'.
I obeyed and cleaned & slightly oiled the outside only.
Well, after reading your tutorial I dared to open all four. No problem (the first time the mainspring jumped teen feet away), and I also must confirm that the inside of those 'trommels' were clean as if they just came out of the factory.
Thanks for this lesson.
__________________
Joop
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