I bought a Promaster Bluetooth Sony Remote (equivalent) It does not work either. I searched on line and found this comment in another blog community for the JJC sony equivalent and that JJC now has and upddated version that apparently works.
I have a similar problem. It is very narrow, but exists. I can see light through it. I was wondering if it might effect the weather seal on the portion that goes up inside the camera where the contacts are. I was considering putting a layer of waterproof foam gasket in the space.