I've been playing with the idea for a long time of making a sand cast of a ih weight out of pure lead or a "stronger" mix. I did the math once before and they really wouldn't weigh a whole lot more iirc it was less than 15 lbs.
I've also played with the idea of using a old wheel as a mould to make a "fitted" weight that would sit down flush with the back side of a valve stem which would still allow a ih weight to be bolted on top. Just haven't gotten around to gathering the lead. Only have maybe 80 lbs at the moment
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