Heatsink
Hi! I was trying to unclog my printer (I manage) But I accidently unscrew the hotend.. What should I do in this case? since I'm not able to screw it back again. Is there a missing piece? Please see the picture: 
Thanks!
RE: Heatsink
Is there a missing piece? Please see the picture:
Nope, there is a piece broken
the small thread goes into the heater block, the big thread goes into the heatsink... and normally the thin part holds the bits together
when you put it back together you need to make sure that the nozzle and heatbreak should be screwed against each other
this is for mk3, but the process is similar for mk2
https://help.prusa3d.com/guide/how-to-replace-a-heatbreak-heaterblock-heatsink-mk3-mk2-5_14944
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK