@mrbombermillzy it does have the proper manufacturer details on the back, K.G.M. Electronics LTD but all I could find was the companies house details and the details of the company closing.
I think ax soon as I can solve the horizontal size issue with another variable inductor I'll be sorted.
I've managed to get the old ferrite screw out and hopefully found a couple of new ones on eBay, so hoping I can get it working and glue the whole thing back together once it is.

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If it ain't broke, test it to Destruction.