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You can try getting some dumbbell weights from a sports shop at Queensway or Bras Basah Book Centre. You do not need a locking screw if you can sandwich the required weights between 2 counterweights.
Kayheem, I've thought of this idea as well. Since we are going to have one counterweight first, the second has to have a locking bolt first. By the way, is it possible that unstability at the countweight shaft might happen? Let's say the sandwitched counterweight might push both the counterweights to and fro.
Clear skies,
Robin.
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same here.... it is a novel idea to use gym weights as counterweights, especially when one could put them in between two conventional counterweights... i do that for a couple of 1.25KG gym weights (with enlarged central holes) in between two 7-lb Losmandy weights. even cheaper than custom weights!