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The bulk of the material used to make a microwave is steel, and not thermosetting plastic. The cavity (the cooking space) is a metal "cave" with a door on it. There will be some components in an oven that are made of thermosetting plastic, but the bulk of the construction material is mild steel. Steel "seals in" microwave energy. Microwaves can pass through most thermosetting plastic. And that would be bad.
I would replace the whole door to be safe.
I had to replace part No 8182408 - the washing machine door handle. There is a plastic bar in the middle of the assembly that broke because the door was opened too hard.
There are two springs, the latch, and the plastic piece that brings it all together. The smaller spring is the key, call it the L spring. It is shaped like an L and goes around the ends of the latch. The other spring is the larger and straight and goes around the tops of the plastic piece. The straight spring goes in with the crossbar facing on the outside of the washer. The latch with the L spring fits in between the plastic crossbar with the U shaped end pressing against the latches inside bar. The antenna of the L spring needs to wrap around the plastic bar and fit inside the straight spring bar. This applies pressure on the latch to stay closed. When the handle is pulled, it releases the pressure and allows you to open the door. The Metal bar is used to hold all the pieces together and once you have the alignment right, put it back into the door with the straight spring antenna tucked in the spots on the door, as well as the metal bar ends. Screw in the two spots that holds the assembly in place and you will be set. The door should open and shut easily.
If you still have enough surface area to work with, you can repair the plastic where the screws go with two part epoxy. You can get it in a package that looks like a big double barreled syringe. Take the switch right out, cut a piece of plastic from a plastic lid or something similar to fit, and glue it on with the epoxy. When it is dry, drill two very small holes where the screws are supposed to go, and reinstall it. It will probably outlast the machine. (do not try to fix it with crazy glue or anything like that. You need the thickness of the epoxy)
You will need to access the door handle mounting screws and remove them to replace the door handle. To access these screws on MOST microwave ovens, you just have to remove the inner door panel that goes around the perimeter of the glass. This can be easily be accomplished by using a small screwdriver or putty knife and carefully insert along the seam of the inner panel and pry the plastic up. Work your way slowly around the perimiter of the glass to pop the panel loose. Use care not to pry against the glass. The glass is tempered and also has an RF shield that shields you from harmful microwaves.
With the inner panel removed, the door handle screws are visibile and can easily be accessed with a screwdriver. Simply remove the broken handle and install the new one. Re-insert the inner door panel, gradually working your way around the perimeter of the door glass to ensure it snaps back into place and seats properly.
This repair can be done with the door in place, or you can remove it for easier access. If you decide the remove the door, open it all the way and lift straight up at the hinges. The door will lift off of the hinge pins. On some microwaves, you may have to remove the upper grill cover over the door (if equipped) to accommodate door removal. Place on a hard flat surface with some towels under it for padding. This protects the door facing from scatches.
NOTE: Some doors have a hinge pin that needs to be removed, or screws holding the door in place at the hinge.
You can view an exploded view diagram of your microwave at pcappliancerepair.com for reference. Just type in your model number and locate the parts listing for the door. If you have any questions, or require additional assistance, please let me know. I hope this helps you.
use something lopng and thing, a thin screwdriver operhaps. Pull the metal bar ( part of the spring) to the left. When this is fully to the left push the white plastic part in and jiggle about util the door comes off. Might be easier with sumone to help you pull the dor out as you uch in