Another unit is the "rev lock dyna ring" works like the Rekluse EXP...
But uses 30 ball bearing that travel in tappered slots instead of the
6 wedge shaped weights Rekluse use...

the rev lock can be tuned by the amount of balls you use to alter the
weight.. & you can also put tunstion balls in which are heavyer than steel balls..

I would like to get my hands on one... they sound very tuneable..

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...