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I had to do that on the side of the road when my 18 year old heater core started leaking in the cabin after some bad corrugated roads. I left it bridged for over a year until I found the enthusiasm...

Todd, are you referring to the engine coolant drain plug?
It will have thread showing because it's a tapered thread that you can't screw right in.
I use a short stubby rachet to tighten mine with...