I've had to replace the hotend (v6), thermistor & heater cartridge on a Prusa MK3 i3. When I insert the thermistor into the hotend block, I can secure it with the small set screw (carefully did not over tighten). When I insert the heat cartridge and use the small black screw, I does NOT secure the heater cartridge; it still slides in & out. I'm very nervous about over tightening it. Am I missing a step or something else. Thanks in advance!
