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The debris looks far too small to be a section of snap ring to me.
Click on the original image, then when it appears in a new window click on it again which will magnify it. The scale against the sump plug and pattern on the kitchen roll show it to be very small.
It looks more like the debris from a stripped thread to me.
Nasher.
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Heaven doesn't want me, and Hell is afraid I'll take over. 
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