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Title: worked!
Review: i ordered this large one thinking it was what i needed but in fact i needed the small one. The measurements given in the product description are of the suction cup size unexpanded. So when i measured my valves this seemed like the one i needed but it ended up hanging over a bit on the smaller exhaust valves. Bear this in mind before purchase. it gets roughly 25% larger cupped down on the valve.The grip is great on this thing until even the smallest bit of lapping compound makes its way onto it and then you'll start to fight it. keep it clean before every suction and you'll be home free.
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