Hey Tom,
I want to know how you were able to have two 12 grams weights stay put on an OL Silver. I have a OL Silver II arm and there is only a millimeter wide and the same depth area where they use a very small hex wrentch to tighen or loosen that indented hex hut on the outside of rounded smooth weights or whatever. Did your model have actual nuts on the outside of those areas that stuck out which you were able to drill the lead sinker and then fit it tightly over the nut? I see the picture but I don't see how you were able to have them stay if it's like my arm. Is it possible for you to explain or is your arm somewhat different?