Return Nozzle

[Derb22]

Pool built in 2000. All I have on the three returns are outside threaded pipes with a small narrowing of the inside of the pipe for an eyeball.
The outside cap of this picture, which I bought, fits on the existing threads coming out of my plaster walls. (Without eyeball) However the rotating eyeball piece inside is too large to fit in the pipe. I used my dremmel and sanded the eyeball down to make it work however this really wasn’t a great fix. Are there. Different sized eyeballs available (not diameter of the eyeball opening but a smaller eyeball ). I have reached into the return and it appears there is no way to remove the threaded piece and change it. I can feel the end of the short piece but have no idea how they installed them. I think the must be glued.
I do not feel any slot in the inside of the pipe but I do feel the end of it. Is this a pressed fitting? Glued? Threaded?
Any my advice on how or where to find the correct eyeballs?

 

[Arizonarob]

So are you saying there are no threads on the inside of the return pipe? How are you putting that eyeball in then? I have the same eyeballs in your picture, and they are threaded on the outside, and the returns are threaded on the inside.

If you can, snap a picture of the return without the eyeball in it.

 

[Derb22]

So are you saying there are no threads on the inside of the return pipe? How are you putting that eyeball in then? I have the same eyeballs in your picture, and they are threaded on the outside, and the returns are threaded on the inside.

If you can, snap a picture of the return without the eyeball in it.

My return is just outside thread sticking out about a 1/4 of an inch past the wall. Meaning the threads are on the outside of the pipe. There are no inner threads. It is a piece of short pipe stuck inside the outer pipe but the eyeball doesn’t seat far enough inside to allow me to screw on the cap.

 

[Yev]

First, there are numerous manufacturers of returns. They tend to be more of a standard size, but you might have found an oddball.

Try another brand. But This is teh return that I use, I like it much better than the eyeball style.

https://www.amazon.com/Infusion-V-fitting-Inlet-Return-Venturi/dp/B008DG32FI/ref=sr_1_3?ie=UTF8&qid=1527558585&sr=8-3&keywords=pool+return&dpID=41RcS0Z7IVL&preST=_SY300_QL70_&dpSrc=srch