It appears to me that the top tube may be bent which is causing the lower tube to sit at an angle. There should be enough clearance that the lower tube needs to be raised slightly to seat the lower o-ring before the outer grommet is slid down and seated.
The only way I can think of to bend/distort the top tube is if someone was having trouble with removal and applied excessive force.
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Sam
84 300SD 350K+ miles ( Blue Belle )
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