OK, the symptoms described in Hum Hum Hum re. case swell near the power switch are what I am seeing, so it is pretty obvious the problem is battery swell. I need to find the dismantle FAQ, which try as I may, just does not seem to want to be found. I have a good idea about how to do it: it's time to research safe battery choices! Thanks for help received - watch this space
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One of the few remaining Mk1 owners... #00015