Start with a wide mouth plastic jar, such as the kind mayonnaise or peanut butter comes in.
(hint; use a metal, or other material as a spacer, to allow rod to extend the rod through both ends of jar, for a simple support and lining the jar with rubber matting will extend the life of the plastic)
Fill the the first inch or two of the jar with equal parts sand and water.
Drill a hole in the center of the lid small enough so that your bolt fits but in tightly.
Apply super glue or hot glue to the area around the drilled hole,(tip; use rubber washers/o-rings instead) .
Pull the bolt though the hole so it sticks out of the top. Tighten bolt right away. Tighten second bolt to lock the firsts position
Allow the glue to dry thoroughly.
Add rocks, screw on the lid, and tighten the drill chuck tightly around the bolt. Pull the trigger and let the rocks tumble.
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