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This was a time when many cars were run on a shoestring, and car owners would do whatever they could to eke out a few more miles from their tired old motors. If something could be refurbished, rather than thrown away and replaced by new, then there would usually be a saving to the motorist. The process was called Koetherizing, which, according to the blurb, had been "proved over many years to be the most accurate and permanent method of re-sizing worn pistons".
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The apparatus used by AES consisted of a tubular case, into which the piston needing repair was affixed, mounted on a rotating stand. The full process was described as follows: "Koetherizing consists in subjecting certain chosen portions of the inside of the piston skirt to the peedning effect of a controlled shot blast. The produces a hard skin on the parts treated altering the shape of the skirt and expanding it in a predetermined manners, so that when restored to its correct dimension the piston has both the original ovality and taper. It also gives the piston skirt a resilience which is permanent and fully capable of standing up to any temperature likely to be met with in service."
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AEC could also supply new piston rings to go with the refurbished pistons, so all in all a very useful service.
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