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The "tangs" are stakes. The Al. is physically dimpled or dented or staked.
After you install new o rings and sleeves you can use either a semi dull cold chisel or a medium flat blade screwdriver and small hammer to *gently* tap the edge of the port and deform or re-stake it.
This just ensures that the injector/sleeves don't walk back out of the port.
When installing the new sleeves/o rings use a bit of silicone grease on the o rings to get the sleeves to seat into the port.
Cooper
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