The Yellow jacket is not a strap drive it is Direct Drive. IMHO the Yellowjacket pedal is the best bass drum pedal Slingerland ever made. They are very smooth and quick.
The Tempo King was a fine pedal, somewhat utilitarian , but a good pedal, just nothing special.
Someone mentioned Buddy using the Tempo King, he did but he far preferred using his Rogers Swivomatic pedal even when he went back to Slingerland. The swivomatic along with the COF Fibes snare used to drive Slingerland President Don Osborne crazy when he saw Buddy using them with his Slingerland set.