So here is a model that can give the same thing, a little different. Just extruded the shapes through each other. I would fillet these edges, then boolean things together...



I would think you could work this to get the dimensions from your file... The little fillets in the original file are slightly varying at .061-.062 and .0625...

You could review these and fillet these edges at those values to get the spoke... If the Z values need to be adjust, you could cut off the bottom with a boolean diff at half the height and then do the mirror thing...