Mercury Recoil Rod

A friend was telling me about a mercury recoil rod that can be used in a STI edge.  He thought the brand name was Hart or Heart or something like that.  Does anyone know where I can get one and the pros and cons of one? TIA, Nenette Full Version: Mercury Recoil Rod The Hart recoil reducer. It is a hollow GR with mercury and 2 ball bearings inside. They were popular several years ago but you don't see them much anymore. I tried one and real didn't see much difference. You'll get better results alot cheaper by playing with the spring weights. cannot use one w/ a bull barrel. My experi

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