Plastic Grill Housing Repair

Many of the old grills were ABS. Oatey makes ABS cement. Or, if you're really adventurous and have a dead keyboard, or unwanted LEGO's, make your own ABS paste with some acetone and an old pickle jar.

https://www.oatey.com/products/oatey-abs-mediumbodied-black-cement--1230977158