I have a number of Etti couplings but not the 5mm to 3/16" & all of them use 3mm threaded grub screws. I believe they all are the same size grub screws on the Etti couplings, they are deff not imperial threads.
Thanks Martin! I found out they are 3mm X 0.5mm thread. Found a source and have them coming my way. It's been a good coupler. I like that the length is shorter than Octura and some others. Appreciate the post!
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