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washers on ZF drain bolt

In preparation for the drive to Monterey I changed my ZF oil...actually it's still draining. I'm going to let it drain overnight. When inspecting the drain plug for debris, there were two washers stuck to the magnet on the plug. both are 3/4 inch diameter. one is 1/8 thick and the other is 1/32 thick or...metric equivalent. Where did these come from? My ZF was safety wired 3 years ago and I haven't changed the oil since...maybe 3,000 total miles.

thanks,

John
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