Turn power off to oven. Used a damp cloth to hand Unscrewed glass cover and then removed bulb. Cover was cracked and halogen bulb burnt out. Ordered bulb and cover. Inserted new bulb handling it with a clean cloth to avoid any oil residue from skin. Screwed in cover clockwise with washers. Ensured sequence of washers by checking old glass cover. Hand tightened only. Parts shipped quickly and arrived in 2 days.