I have an older model Delta tub faucet. It operated both my shower head as well as my tub faucet. I have been having a problem with it dripping and was told to replace the washers and springs in it. I have managed to take off the actual knob, but I can’t seem to do more than that and am not sure how to go about going further to fix the problem. I have a low income, so I need to fix this myself. Unfortunately, I am also ignorant of repair work so I have been learning how to do this at a slow pace. I do not know how to remove the cap and adjusting ring to get to the seats and springs. I also think that it may have gotten stuck since it has not been replaced since my father bought the house 20 years ago. Please advise me how to go about replacing these and what to do if this does not fix the problem.