I just moved into my home and some parts are missing from my microwave carasoul. I have the circular glass tray but no support and nothing to connect to the motor shaft beneath the surface of the oven floor. I confirmaed the motor shaft is rotating and the oven heats but I need to replace the carasoul parts. Whirlpool has discontinued a lot of these and I cant locate a repar company to work on it as the parts are unavailable. I checked the on-line schematic diagrams and confirmed I am missing the "support" for the carasoul and a "gasket" for the support. It does not appear any other parts are needed, HOWEVER, I do not see a part which connects to the motor shaft beneath the surface. I still need a shaft extension of some sort to attach to the motor shaft, and extend it through the oven floor hole, into the carasoul support, to rotate the glass tray. I do not see any such item on the schematic. Is it part of the "gasket" or does it come included in the "support" part? I need to know before I invest in items to fix this and still end up missing a crucial item to make it function. Both the gasket and support are still available at various on-line warehouses. But what else, if anything, am I missing? Thank you.

Is the gasket really necessary? What is it's purpose? If I can't locate it for sale, will the oven and carasoul work without it? Or is this piece very important.

Thanks.