JBW's method must be revised on CH -- there is no plunger pretruding out of the lock work in the front, so there is nothing that you can push in from the front, as shown on JBW's article.
It can be put in, then there must be a way to take it out. Somehow you have to hold the main spring back so it does push the coupling..... how about just pushing the plug backwards using a tool.....
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