If you're dead set on making your own (I highly recommend the lifting plates), try using the Cerro metals in McMaster Carr (can be found other places). These are lead alloys with low melting points (the stuff I use is 208ºF) and rather easy to work with. Do it with proper ventilation and gloves, and do not use a torch to melt it directly (very easy to get too hot). Buy yourself a cheap toaster oven and melt it in that. Throw away the oven when you are done.

But, go with the lifting plates. It'll be cheaper in the long run.

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Bill
Planet 6 Racing
bill (at) planet6racing (dot) com