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There's a bit more to it than that, I've played around with those collars a bit trying to do what you suggest with little success.
I believe you need a few more bits to make your male - male rod into the required male - female, then getting them all to stay where they should is another matter, I recall making a stick with male to female, but couldn't get the collar to stay put so the saw head wasn't at the same angle throught the extensions.
From memory, you're a fair bit longer in the tooth than I, so probably more experienced with making things work. Stihl expanded diagram of 1m extension will help you.
I got annoyed and ended up buying 2 new extensions.
I now use old shafts to replace banana strimmer shafts.