You can purchase replacement tilt mechanisms (the gear systems inside the headrail that rotate slats) from specialized repair sites or major home improvement retailers.
(UK-based): A great resource for those in the UK, carrying a wide range of universal and brand-specific tilters. Major Marketplaces & Retailers where to buy tilt mechanism for blinds
For fast shipping or local pickup, these retailers carry universal parts that fit many standard "off-the-shelf" blinds. Blind Spare Replacement Parts & Accessories UK You can purchase replacement tilt mechanisms (the gear
: Offers a massive selection of tilters for mini, wood, faux wood, and vertical blinds. They are highly rated for their "Buying Guide" that helps you identify your specific mechanism. Blind Spare Replacement Parts & Accessories UK :
: Specializes in wand and cord tilt mechanisms, including specific parts like the Graber/Bali/Nanik Hexagon Hole Tilter.
These sites are ideal for finding specific brand-compatible parts (like , Levolor , or Graber ) and often provide repair guides.