Depending on the depth you’d be operating at, what worked well for me and a client was to attach a small clear plastic hose to the manipulator (wire ties), then run the cable back up the tether, securing it every foot or so. To gain samples, we used a small hand operated Jabsco Pump.
If you follow the link, at about the 3 1/2 minute mark you’ll see how we attached the hose to get the samples. It wasn’t pretty, used a fair amount of duct tape, but at the end of the day it worked and more importantly, the client gladly paid!
http://www.youtube.com/watch?v=CNog4rkIUJI
Any questions, just ask!
Chief