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Originally Posted by kbmuri
Did this 6 or 8 years ago. The right knob is a casting of the left knob. I made the mold out of plaster, the new knob out of JB-Weld. <SNIP> Clever idea with using RTV for the casting. I suspect that would work better...
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That JBWeld knob looks great!
There are really two advantages to using the RTV mold: 1. You can easily get your casting out and reuse the mold. 2. You don't have to clean your casting, RTV releases without an agent from most casting materials.