Dear Sten, You said you replaced the carb diaphram, could you tell me where you obtained it and if you know where a new carb (or engine) could be obtained? I supose that a new grassbox would be out of the question! Has anyone made up a working grassbox for this lovely old machine. I was told that Briggs and Stratton make an engine now that could be fitted to the side drive box but have been unable to get its part number, please help...