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| Square holdflask weighted rings. -Sand filled. -Non-scratching low density polyethylene weights. -Decrease weight by opening screw-cap and partially removing sand. -Increase weight by removing sand completely and filling with a heavier material. |
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| Square holdflask weighted rings. -Sand filled. -Non-scratching low density polyethylene weights. -Decrease weight by opening screw-cap and partially removing sand. -Increase weight by removing sand completely and filling with a heavier material. |
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