Today the ram with the new seal has been tested and certified at 90barg. Hurrah! There was a small leak of water past the O ring, but nothing of any consequence. I have now got a ram which meets FRA and Robot Wars rules for custom-built components when used with full-pressure CO2. I ended up going to a local firm, Hebble Hydraulics, for the pressure test on the ram. This was a lot easier than going back to the West Midlands. The cost of £40 was the same as I was charged by HPAC.