Interesting that you say that Burlens sent you back a different pair as I have a pic of your original carbs taken from the top and I thought that they had identical lids and I did wonder if you were using different ones. Where the supposed tickler should be there are just black holes so I guess the underside of those is blanked off.
Ron, these are H4 and not HS4. Quick ID is that the HS4 lids have 3 fixing screws around the edge and inside the floats swing on a hinge The H4 has a single central fixing and the float is a donut which goes up and down on the lid fixing bolt.
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