Regarding to the wood, it is not necessary to change the sides of the housing.
The new wood has, i believe, 2 new small holes in it what makes it easier to guide wires from the outside with a screwdriver. If you don't want this luxury you don't have to swap them
The top and bottom are mandatory tho.
As for further guidelines i would like to refer to the wiki and look at the pictures.
Don't use any excessive force for anything but make sure the hot end part is tight.
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fuchs 0
Mhh, you _should_ at least replace all the wood on the head. Can't say if it is possible to kludge something when not doing.
For disassembling / pulling out the thermocouple and heater (and all party that get heated in use) -> it's always a good idea to warm / heat things that you need to remove, be it "slid in" or "screwed in". Ask any car mechanic :-)
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