I want to lubricate a 10 - 12 yr. old Delta tub/shower faucet; it's a two part handle with the temp control on top and volume underneath; but can't see how to dismantle it; there are no set screws, just a chrome tip to the plastic handle but I can't get the tip to come off and don't want to pry too hard - is that how to get the thing apart?

Click on; http://www.plumbingpartsdepot.com/dela23handtub.pdf for two and three handle Delta tub and shower valves. Good luck, Tom