Homelite ST385 Brush Cutter Strimmer Autopsy. Another blown engine!

We have a lot of undergrowth, brambles etc in the garden and have always used the Homelite ST385 to keep it under control. Well up until last week!! It looks as if the engine has given up, again. Yes, it's happened before! Watch the video and see what I found was the cause. ... https://www.youtube.com/watch?v=oq9Wi0_ct7Y