The Apprentice Series only has a 65mm spindle mount.
It was designed to use the Makita trim router (65mm body) found commonly at big box stores or Amazon: Makita RT0701C 1-1/4 HP Compact Router - Power Laminate Trimmers - Amazon.com
It can also use our @Redlinecnc 65mm spindle: https://www.onefinitycnc.com/product-page/onefinity-spindle-by-redline-cnc-65mm-1-5kw-air-cooled?srsltid=AfmBOorVrR4eg7Qd2-PRVye1xxEKjHbwSndbgj7p-WMK8NOLINFkW5lc