I bought a new e3dv6 recently. While installing it I noticed that my heater cartridge cables were worn, so I ordered a new cartridge as well. My new heater cartridge just arrived today. I attempted to install it in the heater block, but with the screw fully tightened to the point of the block showing deformation, the cartridge is still loose and comes out easily. This is while the hotend is stone cold. It has not even been installed, much less heated up. There seems to be something quite wrong here. How do I get it resolved? Thanks.