My father had a Spotmatic (I think I have it now) on which the battery cover resisted almost all attempts at opening. It had been abused by a previous owner and the coin slot looked more like a ploughed furrow.

The only way we could open it was to drill two small holes in it and use a pair of needle nosed pliers to apply rotation. There is a risk of drilling into a mercury cell with this method though.



Steve.