What type of insert does this bar use?
Negative or positive?
http://www.ebay.com/itm/Valenite-BH...ring-Bar-/281626686037?_trksid=p2054897.l4275
Negative or positive?
http://www.ebay.com/itm/Valenite-BH...ring-Bar-/281626686037?_trksid=p2054897.l4275