This is not the first time that I have seen this now, the piston stem seperating from the piston body, it is only a few but a few to many, any suggestions on a fix?

I can post more pics but this is the latest report that I have seen, have a look at the vid and see what the piston stem does some way into the vid

https://www.youtube.com/watch?v=IyNX...youtu.be&t=129