We have a microwave with a three-legged plastic "spider" that sits beneath a glass turntable to place the food to be heated on.
Each leg of the "spider" has a vertical wheel at the outer end that trundles round in a groove as the turntable rotates.
Each wheel is held in place by means of the end of the "spider" leg being split and sprung outwards, passing through the wheel, which is more or less a large plastic washer.
All went well until one of the pieces that go through one of the wheels broke off.
I would glue it back on again but I don't know whether the glue would react to microwave radiation and boil away, or poison the food (cyanoacrilate looks like cyanide to me), or blow up!
I can't put in a metal reinforcement as you are told not to put metal into the microwave.

Any ideas?