It sounds like the "Status" model: post a photo to confirm.
The plastic plug is just to locate the screw that secures the (missing) cover and is a push fit: just pull it out.
The usual quill stem expander bolt can then be seen.
Having said that, it can be a tight fit and the plastic stretches and tears if you use pliers directly on the plug (don't ask me how I know this).
Fit a screw (the original looks like a drywall screw) and use pliers on that.
@Scilly.Suffolk started
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It sounds like the "Status" model: post a photo to confirm.
The plastic plug is just to locate the screw that secures the (missing) cover and is a push fit: just pull it out.
The usual quill stem expander bolt can then be seen.
Having said that, it can be a tight fit and the plastic stretches and tears if you use pliers directly on the plug (don't ask me how I know this).
Fit a screw (the original looks like a drywall screw) and use pliers on that.