iPhone had back glass crack and vibration feedback from the haptic engine and thought “dang, engine must be messed up from being dropped and cracked”. Well looking online and seeing common issues with “screws being lose”, I figured… Let us tackle this fix. 10 minutes later, screen is removed carefully and professionally and 2 screws were sliding around in the phone with 2 more barley holding the engine. Screwed in. Phone haptic is feeling good as new :D