[murphy512]

I would not do a bluetooth conversion on a rare/valuable radio, but I have fitted bluetooth on some radios for friends, usually 50's radios.
It can be done without having to drill any holes and the bluetooth unit can be easily removed if so wished and nobody would be able to tell that the radio had previously been modified.
The radio would be working as normal and the bluetooth would be connected to the Gram input.
I don't like when radios are “upgraded” to bluetooth by destroying the original radio.
Aldo