Hi I just saw your post. I use the clamps, they are absolutely for planking. The side with the spring and brass insert attached to the frames for a plank on frame model and the other end adjusts to hold down the plank above or below as it is glued on. I too have picked mine up along the way and used to use more extensively. Not much use for anything else I have found. I have developed my own system now for planking which is variable to meet the needs of the particular fit. Sorry I don't have a picture.
Regards, Dave
