Prevent motion blur outside of a mask?

Hi, is it possible to prevent the motion blur effect from being seen outside of a masked area? I am creating visual storyboard/references for slot machine programmers. I have created my reels symbols in a long stack, then drag vertically over x amount of frames, which look like they are spinning using the pan behind tool and a mask. Problem is when I add motion blur to the symbols the blurred reels extend outside the mask area and bleed over onto other items. Anyone know any easy fix?
Regards

Use a track matte, not masks on the layers themselves. That will make your workflow generalyl more efficent, too, as you can use normal move operations...
Mylenium

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