Seeing as you had trouble with your gearing it would seem most likely to be something to do with that adjustment. Its taken the heavier weight of the 12 inch to show it perhaps.
I haven't heard that alarm and the CDK17 is quite heavy.
I take it you are balanced and no guide scope on top?
I'd say you are on the right track. A post to PME support forum may be the go.
Greg.
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