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Ridge reamers seem to be very rare and expensive in the UK, and not available for hire. A local machine shop advised me to either use stepped rings if available (prob not) or to use standard rings and take off the sharp top edge with a fine stone.
I checked the piston to bore clerance and this is within limits, so bore should be OK. Ring gap was well over limits, but rings will be well worn, and the gap should be much smaller with new rings (I hope).
