06-19-2011, 03:58 PM
What do you mean by "field serviceable"? I have used a Manfrotto 3021Pro for years and it has flip locking mechanisms. It came with a small tool that stays in a clip on plastic holder on the tripod itself. This tool is for adjusting the tension of the locking mechanisms. I have had to adjust the tension maybe twice in the 5+ years I have owned it. While this tripod is no longer available, it is too long (25 inches), and too heavy (5 pounds) to be an ideal travel tripod. But, it is really stable and is perfect for portrait work, which is what I purchased it for. With my 1.8 pound Manfrotto 222 grip ball head, I get a workout everywhere I travel with it!<img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' />