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Old 29th Mar 2008, 6:06 pm   #3
igranic
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Join Date: Jan 2005
Location: North Bedfordshire, UK.
Posts: 395
Default Re: Making Replacement Knob Brights.

Skimming the part to the correct diameter. Note the trimmed-off waste to the left of the cutting tool.
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Before removing the finished trim from the convex tool, it is placed in the chuck and polished under power using very fine emery cloth and metal pollish. Alternatively, if a 'spun' satin finish is required, then fine or medium emery paper can be used, omitting the metal polish.

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After removal, the inside of the trim is cleaned and roughened with coarse emery paper to provide a 'key' for the adhesive. The completed knob-bright is then coated with Rustins Clear Metal Lacquer in order to preserve the shine and prevent tarnishing.
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Finished bright fixed to knobs with urethane adhesive.
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Although not quite of production quality I am pleased with the result, and I will certainly use the method again. The shallow concave dome stye favoured by Grundig and Philips may prove more challenging, and would certainly require a special spherical cutting attachment to make the tools.

Edward

Last edited by igranic; 29th Mar 2008 at 6:18 pm.
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