IPL

https://spares.bigwarehouse.com.au/index.php?cPath=105478_106640_106674

If drive is slipping at the cutter head end then you would need replace the complete shaft assembly. You can just pull the flex cable out but once it is slipping at the cutter head end there is nothing you can do as the square drive and matching coupler are rounded.

Here most curve shaft trimmer are considered "Use it, Break it, and then get a new one." I don't even recommend anyone buying these units as parts can cost as much as a new unit.