• No screw inside the brake....bloody mystery

    IIRC those brake levers are called GB Arret.
    If you look just below the rubber hood on the side of the lever body you see the pivot (rounded dowel head). This is what the lever pivots around.

    I may be wrong, but on most old brake levers the screw that holds the lever onto the bars will pass through this dowel.
    If you're struggling to find this screw the best bet is to remove the brake cable so it's not in your way, get a torch or decent light and then see if you can see inside the lever body to find a screw passing through the mid-point of that dowel.

    I can't think of any other way they could have done it.

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