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Of this tool. Pretty nifty.
ctsd.webp
 
It is interesting that in order for that tool to work, the main long shaft is made of aluminum. This is because if the mass of that shaft were higher such as if it were made of steel, then it would dampen the jolt and a much larger moving weight would have to be used.

There was a WWII movie where there was a problem with the pin in the front of American torpedos not transmitting the jolt well enough to trigger the primer to cause the torpedo to explode when it hit a enemy ship, and the solution was to use an aluminum pin. The sailors initially did not use the aluminum pin when it was sent to them because they thought that it would not hold up under impact. But when they use it, it worked, and solved the problem, and then there torpedos became reliable, instead of just hitting the side of an enemy ship and not exploding.
 
I'm using this on a 440 Chrysler. It has all the common American sizes. 3 or 4 different diameters on the bearings, need to check...
 
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