Transformer Thumb Screw just turns...won't open

[TrainLarry]

If the binding post is turning with the thumb nut, then the transformer will have to be opened and the binding post will need to be replaced.

Larry

[skippygp123]

I have a #1 Transformer with 3 posts. The variable voltage thumb screw turns and turns but won't "open" so I can put the connection wire under it to tighten it down. Any suggestions? Thanks! Ed