Your major tool trucks have been carrying kits of that design for years and they work ok. When you clamp the line into the block you have to make sure that it is super duper tight or it won't work. The one they have offered there on e-bay looks like a cheap piece of crap and I would not spend my money on it. The one that I bought off of the Snap-On truck 20 years ago is of that design and like I said it works "OK", somehow I think that the cheap knock off is not going to work better. I would look around a little more and plan on spending more money.

Mark