Depending on how far down your key screws in (drip tip part) the EC-Mesh coils might be too short to make a good connection, if this is the case just carefully pull the center post out of the coil and put a thin o-ring on the shaft before putting it back. That will give a little more height to the coil for a solid connection. I have one of the Novo flush keys on my authentic so it might not be an issue with the SXK.