I have broken the toilet handle, the metal part has snapped off and there is a small stub remaining which you can still use but need to handle carefully when trying to flush the toilet.
How do I actually replace the handle on the cistern?
Take the cistern lid off take off the split pin holding the arm square rod in place. slacken the securing screw of the syphone arm on the rod and draw the rod /arm [what's left] out and replace with same from most DIY stores.
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Try fixfault.com to fix toilets.