I never should have brought up the explosives, I knew he'd figure it out. Can't take him anywhere. I'll try out a spark plug in the morning (when I'm back out in the shop). Sometimes I keep my eye out for river rocks that are both smooth enough but have enough tooth to the surface to try to sharpen a knife with. I will start asking my knifemaking friends about this topic, many heads better than one with the exchange of good information being the goal here.
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