I don't recall any vids during my apprenticeship (probably too old) but I do remember being shown some very graphic photos of what happened to a chap who sat on a truck wheel with split rim ring while he inflated the tyre. In short the rim ring came off and he was propelled at high speed to the ceiling 20ft above where he made a rather gruesome imprint of his bent and twisted body
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Glad you're going to sit on things for a while Dave, you know it makes sense
D.