sorry for a really delayed reply. thanks for the curiosity about my pair. HAHA here
i used mmcx connectors found in shure iems, you can source them in different online stores
first, i opened them with a cutter. it's really easy, no pain in opening them. I cut down the cable in a length where i leave the right amount of wire to solder the mmcx.
soldered the mmcx
here you go
put the cover and re enforce it with epoxy clay for steel. the one you knead and shape it the way you like. the total cost will not exceed 15usd i guess.
not sure with the currency conversion
I hope i don't violate any rules in posting my method