I'm totally lost and you are my last hope. I spent my day trying to stick these two faces with the magnet. I followed all the tutorials I found about to snap an object to the face of another object. I missed something but what?. Here the two faces. Thanks.
Firstly join the 2 meshes. Then select only the faces you want to stick (, in the image that you post the axis you want to scale is x so) press s to scale then press 0 (be sure you set pivot point to median before doing this).And the faces will stick together . I am not sure however if thats the answer you are asking for.