Keep a look out for used magnesium alloy headshells on eBay – the Denon PCL-5 weighs 6g, and is a fairly common model. I bought two of them a few years ago from a seller in Hong Kong who frequently advertises tonearms, headshells and cartridges. ADC also made a magnesium alloy one designated the LMG-1, which is around the same weight, and also relatively common, although neither it nor the Denon have adjustable azimuth.