On Mon, 07 Nov 2005 15:25:31 GMT, "Greg Krynen"
wrote:

Okay try this...

Use putty style silicone mold material (it mixes by squishing it together).
Put the mixed material into the wheel and let set (about 10 mins). Remove
model once set by simply pulling it out.

Now use this mold to create another mold using more of the putty. Simply put
it on a flat surface, mold the new lump over it and let set. (Oh side note,
powder the model or it might stick permanently to the mold body.)

You should now have a mold of the correct dimensions of the wheels inner
spaces ready to receive molten lead (or lead free white metal/pewter) that
can withstand the low heat and be reused a great many times.

Lead melts at about 640F. Some silicones will take that .... but you
might have better luck with 30/70 body solder. It's almost as heavy
as lead and melts at considerably cooler temperature.

You could cast your weights directly into the wheels using CerroBend.
It's not as heavy as lead, but it's pretty heavy -- and it melts at
157F. It's specific gravity is 9.4 vs lead's 11.35. CerroSafe goes
at between 168 and 190F, probably about the same density. McMaster
Carr carries these products.