I bought this ball grip from a friend of mine and I need to figure out how to keep the spring in so it will work. If I hold the handle out it will lock the head on the ball but there is something missing that keeps the spring in place that keeps the handle out until squeezed that is missing. It doesn't have a name or model number on it to be able to look it up on line. It is very well built and not cheap at all. If anyone has any information about it I would certainly appreciate you posting it. Thanks, Jeff