BMW Stripped Head Bolt Repair

Picked one by one from a mixed channel. Transcript check: both title readers certain; 4 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only machine-shop and engine-building process videos that demonstrate or explain a specific technique (boring, honing, resurfacing, sleeving, balancing, valve work, thermal cleaning, bodywork with lead, part modification). Exclude car shows, cruises, race events, museum visits, dyno runs and date-titled event clips.