The Speedglas inner cover plate 528015 for Speedglas 9100X is designed to protect the inside surface of the filter from spark and spatter.
You need to use this cover plate, because failure to use an inside protection plate with the filter voids the warranty. If spatter or sparks cause damage to the glass your warranty is over.
You need regularly clean cover plate with a soft cloth and replace if any pits or scratches occur.
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