Modelling a Dzus 1/4 turn fastener in Inventor

Hi all.
I am trying to model a Dzus fastener which has a 1/4 turn slot in the bottom.
I have seen a few people attempt it, but have never seen anyone do it correctly.
The way I see it, is if you have a round extrusion and twist it 90 degrees as it moves up, then cut that from a base model then you should have what I need.
I just can't figure out how to do that in inventor.
I know that you can apply a twist to a model in 3ds so you should be able to do it in inventor somehow.
You can do it using 3D sketches which I have, but I can't seem to make it accurately.
I have attached my current version for your perusal


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