I posted "Eyeball seat removal tool hack that works great" on Feb 8, 2018. It seems this may be the same problem. I'm pasting the old posting below attaching the original photo.
I had an eyeball seat that needed to be backed-out but it was badly stuck, I think it's a Hayward. I first tried the Hayward SP1419T seat removal tool, it was useless. Just not strong and rigid enough even when a wrench is clamped onto it. I briefly checked this site and the internet and found little to help me except for some professional tools that are metal with a Tee handle that run big money. I measured-up the plastic Hayward tool and looked around my shop for something I could jury-rig and eureka, there it was.
Solution:
The Stanley 55-515 Wonder Bar (flat pry bar 1-3/4 x 12-3/4) has a short end that's a little wider than what the tool needs to be and the thickness is exactly what's needed. About 1/16 inch needed to be ground-off from the flair on both sides of the short end so the width was 1.490 inches, the same as the Hayward tool. The thickness is already tapered and measures the same 0.180 inch as the Hayward tool about an inch back. It engages the seat slots perfectly and actually fits better than the factory tool because the tool is inserted until the taper fills the slots. The short end of the bar can now be slid into the slots until it bottoms and the 12-3/4 inch long handle gives plenty of leverage to remove the most stubborn seats. The best part is that it cost me nothing and the pry bar can still be used as it was. These bars can be found for about $10 but this is a very common bar and many people probably already have one. Some similar bars could probably also be used but they might not fit as well.
With any luck this will help to salvage some fittings and save time and money for some pool owners.
