WANTED: Replacement HMV 5A / 5B backs

[Inigo]

Yet I've had only three of these soundboxes, all mazak backplates, and except for a broken connector neck (easily repairable) I've had not problems with them. One of them I polished a bit, for it seemed to get jammed onto the front ring, that had to be cut and then resoldered to make it fit again. But since then it works marvelously... See this video... Don't trust your neck! It loaded sidewise and I cannot rotate it straight!
https://youtu.be/dWRWC8RaDOA
Others in my channel are also recorded with these soundboxes... They perform very well!

[soundgen]

Brass back taken