Neither could I even with an Evermore helmet, so as you can see ended up using these wires / connectors from some set on amazon but swapping the bits that clip onto the headsets (just twist the metal part going into the headset mount a bit and pull):
https://imgur.com/a/EEcdwhS
Holy crap I'm surprised you got those in? what are the rails from?
TMC Airframe, but they slide just fine into a cheapo Fast helmet I have too. Again, it's just applying enough force.
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