Ankarsrum mixer

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I just bought an Ankarsrum mixer. I noticed that the roller does not completely lock in to the pin, it can move up and down about 1/4 of an inch. Is this supposed to be loose, or am I doing something wrong?

 

I just checked, and mine is the same.  Once the roller is pushed out against the rim, it will be at the right height so I wouldn't worry about it.