Trying to replace a delta cartridge everything is fine until I try to remove cartridge it will not come out. Saw the video on line and it came out by prying with a screwdriver. Do not want to use too much force... afraid it may bust something. How much force can I apply, before I call a plumber?

Hi Frank

Can you post the address of the video you looked at? If you can do that I can tell you exactly what the next step is, OK?

Otherwise, a model number of the Delta faucet may also do the trick...

Thanks!

Mark