Delta faucet had a constant drip,I changed the diverter,the seats and springs and reassembled,good news the drip is gone ,bad news is now it is leakingfrom theback of the mixer valve, any sugesstions

Is this a shower, tub, sink or lavatory faucet?

Tub,single handle

If this is your faucet, (see image) show us where the leak comes from. Regards, Tom

I found the leak,it is from a approx. 3/8 copper tube that feeds the hot water into the mixer,how hard woud it be to repair this?the leak is where the tube connects to the mixer

You have two options, (1) you can dry everything off both out and in and resolder the joint **or** (2) you can purchase Fis Stix, shut off the pressure and epoxy the leak. I recommend door number two. To check it out click on;
http://www.stopit.com/fixstix.htm Good luck, Tom

Thank you very much ,just placed a order