Handheld food blender with multiple attachments

A handheld food blender, comprising:

• a main body configured to house a motor;
• a drive shaft assembly removably connected to the main body, the drive shaft assembly having a transmission shaft configured to be driven by the motor, the drive shaft assembly including an elongate housing and a plurality of lugs at a distal end of the elongate housing;
• and
• a processing tool attachment removably connected to a distal end of the drive shaft assembly, the processing tool attachment having a food processing implement and a drive shaft, the processing tool attachment further including a plurality of keyhole openings corresponding to the plurality of lugs of the drive shaft assembly, the plurality of keyhole openings including a clearance portion and a retaining portion and being configured to receive the plurality of lugs of the elongate housing;
• wherein the transmission shaft is configured to transmit a rotational output of the motor to the drive shaft of the processing tool attachment to rotate the food processing implement;
• wherein the plurality of lugs are configured for removable connection to the processing tool attachment;
• and
• wherein the at least one of the plurality of keyhole openings includes at least one protrusion forming a reduced width section of the keyhole opening adjacent to the retaining portion.