Thanks that's really helpful - I thought that might be the case. Unfortunately the cheapest I can find a replacement lever is about £200 if I can find one at all as they always seem to be out of stock :(
https://www.planetx.co.uk/i/q/GBSRRVHD22XYZ/sram-rival-(2x)-hrd-hydraulic-disc-brake-caliper--shifter#GBSRRVHD22XYZ-RE2-1900-20PP
@Riotkid started
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Thanks that's really helpful - I thought that might be the case. Unfortunately the cheapest I can find a replacement lever is about £200 if I can find one at all as they always seem to be out of stock :(