Pointy Tweezers are fabulous for helping form knots. You can also use them for picking up, poking, pushing and prodding!
Pass the tweezers through the loop (before pulling it tight), grasp the leading thread where you want the knot to land, and then pull your working thread to tighten the knot. (See picture from source unknown from internet.)
Fabulous for knotting silk cords for example knotting pearls, but can also be used on thicker cords and cottons.
The tool is stainless steel and non-magnetic. It is comfortable to hold, has smooth tips, and is about 12.25cm long.