How to get inside a radiator valve to fix a small leak

[sololite]

I've got a small leak from what looks like a Lusso radiator valve. See attached pic. I want to take the cap off to fix it but can't find instructions on how to get to the spigot/gland/nut

Does it pull off/wind all the way out/or have an end cap that should be prised off?

Thanks for all advice.

Chris

 

[oldbuffer]

1. The thin chrome disc on the outside end of the main chrome knob unscrews.
2. The inside of it has a short length of thread attached to it.
3. However, in my experience as soon as you undo the end disc, the thread snaps off.
4. Easy fix if you've got a lathe, otherwise a new valve.

 

[sololite]

Very

1. The thin chrome disc on the outside end of the main chrome knob unscrews.
2. The inside of it has a short length of thread attached to it.
3. However, in my experience as soon as you undo the end disc, the thread snaps off.
4. Easy fix if you've got a lathe, otherwise a new valve.

Very much appreciated. Thank you