Hi! I've been having problems with a leaky tap in the kitchen sink. Unfortunately I cannot remove neither of the handles to check whether rubber warshers are worn out. The problem is this is a retro-looking tap that I cannot crack as to how to disassemble it. Upon removing the cap I managed to unsrew the screw underneath it... and that's it! I would expect the handle to be now easily removable but that is not the case. Additional info: there are no smaller screws on the side (which is sometimes the case), the handle only moves 30 degrees to the fully open position. Any ideas what would the next step be?