Emailing Cateye is probably a good place to start.
Yup, emailed them and got onto my LBS's distributor too. Just checking if there was anywhere else I should be checking.
SJS are well known for having a great selection of fiddly parts, but this might be pushing it a bit.
I’ve had the mount break on my excellent Moon Meteor Storm light so it currently looks like this:
@birofunk started
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Emailing Cateye is probably a good place to start.