The SA3135 is designed to closely resemble the Rolex 3135 movement, but it really is not a "copy".
If your stem pulls completely out after a watch smith fixed it, then you need a new watch smith far more than you need a new watch.
If you can post some pics of your movement perhaps we can suggest a solution - like where to buy a replacement stem or an entire replacement movement.
In short - give up your hopes of a clone 3135 anytime soon.
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