Picture of How to Make Lost Knobs of Antique Radio
Antique Radios found in Auction site or flea market are hardly maintain their original exterior. Especially tuning or volume knobs often would have been lost. Such radios lacking some parts often trade cheaply. So if you don't strictly stick to originality, you can restore complete receiver economically.
Remove these adsRemove these ads by Signing Up

Step 1: Ingredients

Plarepair(TM)(Plastic repair kit) is one of resin casting kit, same as "Super-bond" that is popular for dentists.

This time we are going to use these ingredients:

1) Plarepair (TM) powder (black)
This is 100% acrylic powder.

2) Plarepair(TM) liquid
This is Methyl methacrylate

3) "moulage you" (型取り君›). mold plastics
It is low temperature deforming material, a kind of polyethylene resin.

3) Another old radio's knob for a prototype

4) A new general-purpose knob
It should be about 5mm smaller than prototype knob, and the hole diameter must be match the shaft of VR or rotary switch.

You can buy Plarepair here. And perhaps there are other products similar to it in your country.

Step 5: Polishing

Picture of Polishing
After taking off the mold, there may be some burrs. Cut them and polish.

Step 6: Weathering

Picture of Weathering
The new cast must look too new and shiny, so it would better be weathered. I splayed gold (or other) paint on cloth, and rub the knob with it.
altomic1 year ago
awesome. simple but so effective.
I especially liked your weathering detail. Brilliant.
Thank you.
sixsa901 year ago
lol looks easy
Machine1 year ago
Very nicely done and you've solved a big problem among collectors.
Good work! It looks nice.