Does this setup seem like it would work with a good needle valve?
http://www.ebay.com/itm/330786043459?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
http://www.ebay.com/itm/330786043459?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649