When I first got my trimmer, I had a hard time getting some casings to fit. It was too tight.
Inside and underneath the housing, there are some thin little washers that make the pressure and space to hold the case when you let go of the handle. I had to take out 1 or 2 of these washers to make it work. You might give that a try.
I cant really explain it better than that. Turn the trimmer over and you should see what I'm talking about.
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