I have a Delta single lever shower faucet that is about 15 years old.
Last time I changed a leaky valve and while removing the retainer
ring, I twisted the shower body a little. Fortunately it did not
break, but now I need to remove it again, and this time it does not
want to budge. I really do not want to replace the whole shower body.
Any tips on how I can take the retainer ring off?