OVERSEAS sellers took Hang Seng Index futures on a fairly volatile ride yesterday, with the September contract ending the day 230 points down, at 9,835. Volume was healthy, at 14,149 contracts, as trading focused on support levels in the morning and afternoon sessions. In the morning the contract traded between 9,940 and 9,880. Overseas selling at the opening of afternoon trading took the index to the 9,850 support, which was tested and marginally broken. Dealers expect further downside today as nervous investors get out ahead of United States retail sales figures tomorrow. The October contract was off 240 points, to 9,845. Open interest for Friday was 33,515 contracts, of which 33,200 are in October, 217 in November and 96 in December. Jardine Fleming said index option trading focused on puts. There were premium sellers among those who expect the bottom has been hit, as the market finds support around its current close. Bears bought though.