kitto makes them for 5/16'' (8mm) and 9/32'' (7mm). i suspect the 9/32'' will be just fine for 6.5-7mm shafts. they're not cheap at 65usd but with current exchange rate they're a down right bargain for you guys. i have some for 5/16'' shafts for 60usd.
here's kittos site
Internet Custom Spearguns
steve
