sorry..yes the servo only jitters every few seconds. This is the pan/tilt kit I am using (the servos came with it): http://www.robotshop.com/ca/productinfo.aspx?pc=RB-Dag-29&lang=en-US
i can't find the spec sheet for my servo... but this one is very similar:
http://www.jetfoamy.com/index.php?route=product/product&product_id=80
thanks for your help
rdeans