We still use the expression "clogging up the works".

I found this in the AHD, which accounts for the unusual spelling of calibre:
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sa·bot ( P ) Pronunciation Key (s-b, sb)
n.
2)A lightweight carrier in which a projectile of a smaller caliber is centered so as to permit firing the projectile within a larger-caliber weapon. The carrier fills the bore of the weapon from which the projectile is fired; it is normally discarded a short distance from the muzzle.
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Now, where did that come from I wonder.

ED.: Is that OK now?