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The bicycle tool in the first post would have to be spring steel to pass through the smaller bore then spring out to hug the bore and catch the 1/16th shoulder.
You could fake it using steel or even aluminum/copper tubing/conduit. Make the two cuts and use a nut/washer/threaded rod to expand and hold it spread after passing through the smaller bore.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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