cartridgedeltaplumbingshower
The complete album of images is here https://imgur.com/gallery/mOgTMZ8
I have removed all of the screws and the nut shown in the picture but I can’t manage to pop off the rest of the handle to get to the cartridge. I am trying to remove the handle so I can update it to a 1700 series handle. I found a similar post here but the detail of how to remove the handle we’re not provided.
First of all the model that you mentioned does not correspond to the picture that you have on there unless it is a much older model it does however fall under similar faucets that I have worked on myself. The cap you mentioned that you can't get off does have to come off. Right there where the grooves are there is a joint that unscrews that cap. Yours has just gotten so tight you can't get it by hand. A pair of channel lock pliers and a rag to try to prevent any marring if possible should do the trick. After you get that off there will be a little grey or white plastic cover with an odd shaped hole in it that that brass stem comes through. That cap comes off and then that stem is attached to a metal or plastic ball that has holes and or slots in it. It just rests in that . You must remove that plastic cap and then you will see two or three holes with rubber cups and springs in them. Remove the cups and the springs with needle nose pliers. You will have to take all the parts with you just removed to the hardware store and they will have Delta parts or similar replacement parts made by other companies that will fit your faucet. Just match them up to what you have removed from your faucet and take them back home and put them in reverse order and you should be good to go of course you have to turn off the water to that faucet which usually means you have to turn off the water to the house. Oh yes and by the way if you do have to mark up the original chrome cover with the grooves on it in your picture with the pliers getting it off a replacement usually comes in one of the kits that you will be buying. Good news is it is pretty simple once you get that super tight cap off.
After weeks of searching, I stumbled on a picture of a diverter handle that has the same icons for shower and hand-held positions that my handle has (see the third picture in the original question). Knowing that the handle in that picture was made by Grohe, I started searching Grohe's website and found an almost identical diverter (based on the parts I can see). The only thing that is different is the length of the knurled part of the stem.
Armed with this knowledge, I used the WayBack Machine to find an older model.
Best Answer
Have you tried one of these?
These are used for removing pulleys from shafts. You are likely going to need to sharpen the points to fit. With a 3 jaw puller it's often useful to wrap a stretchy cord around the jaws to keep them from slipping off a narrow edge. The end is either a 1/2" or 9/16 end. use a socket on it.