I've used the levers types, but they seem to push the spring off center.
I inherited a compressor from my Dad that has two arms that engage the spring coils and it has a knob on top for tightening it down. He welded a 5/8" nut on the top of the knob so a socket can be used. Works good for me and it leaves both hands free for handling those pesky keepers. I've seen them for sale...can't remember where though.