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Hi folks. I'm a new member to please forgive me if I'm in the wrong place... Just wondering if anyone has any advice on pressure testing the lego pneumatic systems. I'm building up some old models, I know I need to replace bits, but want to know which bits without going through hours of swapping them around. Also, what's the best advice for old pneumatic rams that are a bit 'lumpy', is there a safe way of lubricating internal seals? I've thought of a hyperdermic and thin motor oil, but don't want to use anything that's going to damage the plastic or o-rings. Any help gratefully received.