I use a red colored leaf blower/vacuum as a vacuum. If the leaves are dry they are really broken to bits by the metal impeller. Some dust size, most about 1/4 inch or so. Reduces the volume a lot, and better size for the worms to eat. Most of what I have is under an old sheet of plastic but I don't think it would blow away. The electric blower/vac was purchased at HD for $60 or $80.
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