Anybody that got one of these did very well. It’s one of those group buys that I should have got on but my one looked great although over fifty years old, plus I had a second hand spare one. Well I was fidgeting about under there and I noticed a hairline crack in mine when under pressure. Long story short, I changed it. The difference is like steering in a car park with half flat tyres, then pumping them to fifty plus. I honestly didn’t believe there could be that much difference. Ozziedog ,,,,,,,, check yours closely folks.