My Harvey deco 3 way tap was dripping and after several months trying to get the correct cartridge as all the 1/2 cartridges that I've ordered from different suppliers were too small.
I've contacted tap magician and spoke to Lisa. She asked me to send a picture via email and she responded with the link to the correct cartridge which I've received within 24 hours. My tap is now good as new. Thank you so much for a great service.