Spare Engine: Chaser

Finally got a chance to use the spark plug thread chaser I bought ages ago - and to good effect.  The threads in the head to be blasted were pretty wonky.  By slowly screwing in the chaser I was able to get them all lined up and now the plug will seat by hand.

I did it without packing the gaps with grease (because I was working in the kitchen), but I see how that would catch all the small metal filings.