the c clamp type that youve pictured often hits on the head near the jaw and
doesn't allow for a full range of motion. i have 2 or 3 of those, a
craftsman, a KD and i'm not sure about the third. they all have
interference. unless ive lent it out, I use a motorcycle style compressor
that uses a hollow barrel to push on the spring retainer instead of a jaw.
the cip1 style works fine if the head is stable on the platform and
everyting lines up. i havent used that one in particular. i haven't found a
head i couldnt work on using a large motorcycle style (hollow barrel) c
clamp compressor, while there are a few that havent worked with the jaw
style c clamp.