Barbara E Baltimore , MD January 03, 2020 Appliance: KitchenAid Microwave Hood Combo KHMS155LSS4 Kitchenaid Microwave Khms155lss4: As others reported the plastic masquerading as stainless steel on Kitchenaid microwave fails (mine lasted since 2006!) the vent fell off due to broken clips. How to replace Screw. Just unscrewed from the top metal, used the bottom tabs to position the new vent in place and snapped in the top. Used the two new screws I bought to screw it back. Less than 5 minutes! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes