obturator pad

obturator pad

[′äb·tə‚rād·ər ¦pad]
(ordnance)
Pad of tough plastic material, forming part of an obturator.
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References in periodicals archive ?
Specifically, the spindle and obturator pad are turning up coated with rust
I think the problem is that the spindle and obturator pad aren't being removed for cleaning and lubing after the howitzer is fired.
While the TM doesn't specifically tell you to remove the spindle and obturator pad for cleaning, that is what was intended.