So this is the tap I have and I’d like to attach an accessory to it. I believe it is threaded and I should be able to unscrew the existing head to be able to use the threads, but I don’t know how to remove it. The plier (correct word?) tool that I have has sharp teeth and it’s scratching and damaging the tap. I’ve tried several grippy, nonslip layers between them to avoid damage but it’s still slipping or scratching the tap. Any suggestions?