Skip the first 22 seconds, it's boring, after that they get to hammering for proper fitment
If you haven't heard of the bigger hammer theory, you aren't a submariner or a mechanic. The theory is this; if it doesn't work, hit it with a hammer (known in scientific circles as mechanical agitation (thank you XO Joachim) ) if it doesn't work after hitting it with a hammer, hit it with a bigger hammer. If it still doesn't work, replace it... it's broke.
video from http://autozine.com.br/video/tecnologia-alema-oriental