Julian,
Remember that you probably have a ratio of 3:1 (or more) between the force on your ram and the end of the flipper arm, and your ram may not be vertical. This will reduce the lifting force more. If you have not bought it yet, I would go for a 16barg ram. It is well worth the extra cost. (I could even sell you mine cheap, if you were content with a 125mm stroke.)
Jeremy
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