Did Nick Mason Modify His Ludwig Speed King Pedal for 'Careful with That Axe, Eugene'?

Nick Mason was a Ludwig Speed King loyalist through the ’60s and early ’70s, but there’s no solid evidence he ever modified the pedal itself for that song’s massive kick drum sound. The Speed King came with a felt beater standard and a spring tension adjustment screw, so those were already available to him. The punchy, almost explosive attack on “Careful with That Axe, Eugene” came more from recording technique—close miking, heavy compression, and Mason playing the kick with deliberate force—than from any custom tinkering.

Live, Mason sometimes doubled up with two bass drums for that song, a setup that didn’t rely on pedal mods. So while he might have tweaked the spring tension to his personal feel, no special beater swap or aftermarket part is documented. The magic was in the room and the tape, not a modified pedal.