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@BillB
In laymans terms, crush the tubing of the chainstay until there was clearance for the chainring!
there was already an area that had been crimped/dented to clear the 32 tooth chainring, I extended this crush along the chainstay until I had enough clearance for the 42tooth ring. I used a combination of vice (to do the crushing), small piece of steel round bar to act as a dolly to crush against, pliers to hold the dolly and a piece of softwood to prevent crushing the back of the chainstay. paint flaked a bit but other than that I'm very happy with the job, I brazed in new track ends so the paint needed doing anyway.