HI CHAPS
i tried to get mine off , many years ago .
their is not a grub screw any-where , it is simply a tight push fit
and glued on with some strong glue
and i never did manage to get mine off

But be warned i pulled mine so hard , when i tune now i can hear
a ticking , in the audio stages of the radio. , cos as you should know
it is optically connected , works simular to how a mouse works , if anyone
has
has one apart . i havent been able to get rid of the noise since .
a little anoying when tuning , as you have to stop to see if anyone is on
the
frequency

cheers de Paul