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You can buy the right base for $36 Your time would need to have no value

"......hot (50-60* C), strong solution of sodium hydroxide and acetic acid. (Drain cleaner and vinegar, respectively.) " This is a strong acid and a strong base. Mixing, especially at high temperature, is a bad idea. Where I used to work we made ejection seats, we disposed of 1000's of...

In some movie theater projector light bulbs there is a chunk of tungsten. They burn out regularly and are replaced. M

Disney Parks have Splash Mountain based on Song of the South but Disney is embarrassed by the movie. M

We do a similar thing. We have bushings that fit the bore and have a tiny hole. Held to a light rings are visible, concentric if the bore is straight and bunched to the side if not. Ones that don't pass the test are cut to become muzzle brakes. Mark