Why to use the nut on the extruder barrel

Just to remind me to writew a small section explaining why a nut is essential.

For those curious for now until a few hours later today till i write it, this is wehat that 4p nut on the brass barrel stops...
http://www.dawning.ca/2009/makerbot-plastruder-crash/

jUST FOUND MY MEMORY STICK AFTER ABOUT A MONTH, - i left it at work, and found my original 'plastic forcing its way out of the ptfe/heater barrel - hence the need for the nut!


you can just see the white of the melted abs poking out of the central hole of the main washer - the second 'bent' washer was to stop the barrel from being forced out.

:D