Autolacing footwear

An article of footwear, comprising:

• an upper portion including a lace to adjust a fit of the upper portion against a foot;
• a lower portion including a mid-sole and an out-sole, the lower portion coupled to the upper portion at the mid-sole;
• and
• a lacing engine removably receivable within a lacing engine cavity, wherein the lacing engine includes:
• a motor;
• a transmission, operatively coupled to the motor;
• a lace spool, operatively coupled to the transmission, including a top lace groove in a top surface of the lace spool, a bottom surface coupled to the top surface;
• wherein the top surface and the bottom surface rotate together, and a circumferential channel formed between the top surface and the bottom surface, wherein the lace is configured to be inserted in the top lace groove and be taken up around the circumferential channel based on a turning of the lace spool from action by the motor and transmission;
• and
• a fastener, configured to couple the lace spool to the transmission, inserted into the lace spool via the top surface, the fastener having a head having a head width sufficient to partially cover the top lace groove, leaving a top gap having a gap width less than a thickness of the lace.