Stephen, mine does not move laterally but bobs up and down; I added the following golf club weights from Amazon - maybe 1-2 ozs - and that didn't noticeably change the bobbing. I may consider adding more weight. GRJ added about 18oz to his. If I do, I will try the pine wood weights; I like the golf club ones because they were coated and had sticky bottoms but very expensive - around $8 for 10 squares to get you 1-2 ozs.
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