Just thought I would post this up about a lever to replace the knob on the Harris bipods that you use to lock it up to stop the swivelling. I just got a couple of them in the mail today and they are great and cheaper than any others. Easy to change over, takes 2 minutes and the fit and finish is very good. They look good as well after being installed.
Here is the link to them.
Harris Bipod Lever Lock Link