Looking for faucet repair parts for early 1973's american standard 2separate handles

My best advice
is to believe everything you just experienced...
(Perhaps an UNSEEN flaw in the "MONOBLOCK")

Buy the replacement faucet... shop around:
I spotted it on eBay... (number not close...)
((but still reasonably priced)).

AMAZON
American Standard 1480 101 002 Seva Single Control Lavatory Faucet with...

Also went to eFaucets (but their site was stunned
(normally GOOD resource... ))
http://efaucets.com/

eBay (concierge... buyer protected... FREE ship'n)
American Standard 1480 150 002 Seva Monoblock Single Lever Handle Lavatory...

Save the old one (parts)and DIAGNOSE
it in your SPARE TIME...

Hope this helps

Carnac the Magnificent

I think you might need a handle remover tool. It looks like two "L"'s facing each other with a long screw going through the top of the two L's . With a T handle at the top. The two L's go up under the bottom of the faucet handle, and the long screw fits into the screw hole for the faucet handle. A dozen turns or so and the handle pops off the valve stem. Cost about 10-15 dollars at any hardware store. hope this helps.

your handles are on this link http://www.faucetdirect.com/index.cfm?page=product:partsDisplay&productId=7881.732&manufacturer=American%20Standard

American Standard has an on-line Repair Parts centre:

http://www.americanstandard-us.com/store/repair-parts/

There is an adapter from the faucet stem to the handle. A small gray plastic faucet part that frequently causes problems for many owners. You will need to call American Standard and ask for a new handle stem connector. The faucet came with a limited lifetime warranty and the part should be free. While you are getting one, you might as well get another for the other handle. American Standard's phone number is 1-800-442-1902.

http://www.plumbingdirect.com/american-standard-060342-2950a-handle-for-silhouette-sng-lev-kit-cast-s/p7620

I have the same problem with an American Standard Reliant Kitchen Faucet that wont swivel anymore. I called American Standard and they are sending me the replacement parts to fix it free of charge, I have had mine 6-7 years and they said it was under warranty. Call 800-442-1902. Good Luck

Look for setscrew under handle when lifted full up.

there should be a little cap covering a allen srew in the front or back of the handle it sometimes looks like the hot or cold sign or chrome pop that off and loosen the screw and pull off the handle there should be a nut loosen that and pull up the cartridge you might be able to find one at home depot be sure to turn the water supply off

if it is 25 yrs old it might be to your favor to just replace the fixture.parts for something this old may be hard to find good luck.