Originally Posted by
Winfried
Is it a double, with the outer ring used for the chain guard?
Yes. I have had for a long time. I think it might have been off a Campi, but I am not sure. I made one for a different bike too. As I recall, the teeth snap off and leave a little that must be filed or ground round to line and a little bit must be ground to get a better fit to where it attaches, kind of an undercut where it attaches to the crank just on the back edge.