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lancaster,
The “white spot” is a platinum vent plug.
It plugs the hole that was drilled to connect the nipple hole to the powder chamber hole.
It’s sometimes called a blow out plug incase of over pressures.

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if I understand it right he thinks the platinum is not only a plug but ends into the barrel and the nipple is drilled from above into the platinum tube. it seems that Manton had experimented with different metals in the flintlock time to prevent the hole from burning out and found that platinum works best.
could be that still use this material also for percussion because in theory there was the same problem when the flame enter the barrel.

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