I have just laid my hands on another 707 which is in a much better condition than my other one - not half as much rust. However, every silver lining has a cloud and this one is a stuck knob - the TUNER knob which, of course, is the rarest of the knobs, it being the large type with a finger hole to allow rotation using one finger.
I tried drilling out the grub-screw from the hole but it proved too difficult to get the drill to bite. PlusGas didn't help the situation even after 1 week's soak so I had to think of another way. I drilled from the front of the knob in the place where I was likely to find the screw- not easy! Anyway, after numerous drillings I managed to get the screw to snap and the nut to fall out of the hole - YESSSS!
I will now fill the hole in the knob with Lilliput and mold it to shape and fill the old "TUNER" engraving. A visit to an engraver with an identical knob should then result in the filled knob looking like the original component - hopefully.
Hi Brian, I've often had to butcher up stuck on knobs. It just has to be one of the rarest control knobs.
Till Eulenspiegel.
I know someone who uses nitric acid for this job. Helps not to have a brass insert in the knob though.
Brian Cuff said
I will now fill the hole in the knob with Lilliput and mold it to shape ........
I think the Lilliputians might direct you to their neighbouring realm called Milliput 
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Thanks for the correction, Chris. I should not have been so lazy and - just o and look at the tube!
Brian, aren't those 'tuner' knobs used on some contemporary HMV radios? I'm thinking the more upmarket ones?
