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found this link: http://www.madsens1.com/pa_white.htm

got jerry's fundamentals book............great info

Burnham's input re: wind and pressure fluctuations makes real sense. also, would be important to have a pressure guage to read differences as they occur.....lift, etc. a buddy of mine told me yesterday that a silvey has a safety feature that if the jack fails, the plate will lock and won't...

yep....that's why i wanted to see what others have come up with..............i'm aware of the downsides..........might just break down and get the right tool for the job..........there's always wedges........

just something less expensive than a silvey. wondering what other folks have done................

Feedback, ideas, successes, failures, pitfalls, with 20 ton hydraulic bottle jacks (with steel plate). Thanks.