Convert round shaft pot to splined or other, without bulky coupler

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Not sure if this is a known trick, so I thought I'd share this.
I like vintage stereos but was frustrated trying to find good quality replacements for the old splined shaft pots. Most, if not all good pots have a round shaft. Yes there are couplers, but they're too bulky. Then I found these 6mm to 1/4" brass adapter sleeves. I cut off the splined shaft from a cheap pot, then took this 25mm Vishay Cermet and cut it down to about 7mm, and using the brass adapter and JB Weld epoxy, I now have a 30mm splined shaft cermet. It feels sturdy and straight and now I can use the original knobs and it fits right where the original pot was. Pretty slick.
 

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I roughed up the shaft and the the brass coupler with sand paper, then I coated the inside of the coupler with epoxy using a cotton swab. Just to be safe, I wrapped some thread around the shaft and pushed it up against the bushing to protect it from any epoxy getting in there.
Let it dry for 24 hrs and it's solid as can be.
 
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Interesting. However, a 5 pack of those brass adapters is $7.79 on Amazon. com and, choke, cough, $69.26 on Amazon.ca. Nice idea, but I'm not paying that much for 5 little brass tubes. (And, just in case someone would like to tell me that I could, in fact, order from Amazon.com - I know that.)