Easiest/fastest to use is the one like hemi71x shows - I bought one like that, along with a foot operated one many years ago when a local shop closed. Also got a small box of assorted ones like the O/P posted as tool#1.

Google T-0158-SP and you will find several companies that sell the one that hemi71x shows, starting at about $135 on e-bay. Google T-0171 for the foot press I mentioned - they seem to start about $400.