Can anyone recommend an inexpensive tool (make/model#/supplier) that works well on a loose, unsecured Y-Block head?

The custom altered example Jerry Christenson depicts in YBM #73 looks fast, but I have time to waste. I don't want to experiment and end up with a drawer full of tools that don't work (like him). I also understand that some require more strength to operate than I may be capable of (torn rotator cuff).

6 VOLTS/POS. GRD. NW INDIANA