Beware of tools
Yes, the C-clamp, in theory, sounds great. I purchased the tool and I used it yesterday. Instead of the ball joint stud moving out, the C clamp opened up. This is a "heavy duty"-looking tool. It cost me $150 for it and was crap. Turning the screw of the tool did not take much of an effort. This tells me the tool has some cheap pot steel, or something.
I have sent an email to the vendor for a replacement. Will let you know if the new one is OK. Again, theoretically, the tool should make life very easy.