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Very much appreciatedThe service manual might come in handy.
Thanks again. Amazing found a special tool idea and it worked great. Made my own@sharky0127 , you'll have better luck if you shift forums.
There's a wealth of material if you search in the "Repairing Your Own Gear" subforum of Do It Yourself - DIY, which is a subforum of Diving Gear
Click on Regulators in the top left corner of your screen and that will step you up the ladder to Diving Gear. Then click on Diving Gear in the same corner and you'll see all the subs.
This thread, for example, is the sort of resource you'll find: Question - Aqualung Helix Pro - Front Cover Removal