Keys are simply shapes on the parting line surface of the mould that nest into each other to align the different parts of the mould.
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Mould Keys - Neills Materials
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Making a two part mold
Mould Making - Gorton Studio
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A simple casting mould for hot metal key copying
A simple casting mould for hot metal key copying
Copying Keys via a Mold and Cast Attack
Mould Making - Gorton Studio