Didnt Tony drill 4 holes.... 2 for wires he soldered to a jack.... the other 2 were used to put epoxy in? Looks like you found a jack small enough that you could just drill out the M12? I like your idea just because all we need the M12 to do is hold the jack solid so it dont come apart taking it in and out..... and to keep it water tight. This way works..... if you use say the buds. Tonys way works if you are putting it directly on a pair of phones using the larger cable. THIRD way is to use your way..... attach a CTX connector on the other end... or .... splice it onto your phones using shrink tube to seal. Looks like everyone but ML can make one now.....
You know i used that JB plastic glue....... i didnt like it Larry for salt water use. That connector has more room ... longer and fatter than the normal M12 we use it looks like. How did you get the jack its self thru the smaller part of the M12 without doing a splice job? That M12 sure looks like the better choice because of the way it all threads together.