There's a hole in the forward face of the delta ring (I think that's the one you called a notch). There's also 2 flat steel springs (really just bent pieces of metal) that keep the outer part of the delta ring sprung away from the inner part. There'll be a gap in the flat springs that you have to align. You may need to use a pair of needle nose pliers or a screwdriver to turn the spring until it all lines up. Then the gas tube should go through it and into the body.
If in doubt, take the delta ring off and see how you've got to get it aligned and then put it back on.
Hope that helps, good luck
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