The X-Y travel slides have grub screws that adjust the "play" (backlash). The manual shows which hex key size (1.5mm) to use and instructs you to tighten them only until resistance is felt , then back off 1/8th of a turn.
While Proxxon is famously known for high-end precision power tools—like the Angle Polisher WP/E Micro Milling Machine MF 70 —they also maintain a headquarters in Wecker, Luxembourg , at the address 6-10, Härebierg, L-6868 Wecker proxxon lu-6868 wecker manual
While there is no single official "alarm clock" manual for a Proxxon LU-6868 The X-Y travel slides have grub screws that
Clean the device with mild soap or a damp cloth; avoid alcohol or petrol-based solvents that can damage plastic casings. at the address 6-10