Note that there are various types and styles of this rotary encoder:
That hit on Reddit is exactly the same board, so that must be how the original shaft looks. I am thinking Alps EC11 like these
Not sure if its a D shaft...or curcular. He lists 15 or 20mm circular or D shaft in the drop down. Then the question is , are the detents the same. Guess I would have to take this one apart to determine the number of detents. Usually once you find the number of detents the electrical spec seems to match. 30 detents maybe....
Is this the radio?
If you buy a cicular shaft, you can always use a file to convert it to "D". Same with the length of the shaft, which can be cut shorter. Stretching the shaft can be done by filling the both ends to a "half shaft" and either pinning or gluing them together.
I'm not sure about the cost of shipping to/from UK, but at the stated price, you could probably afford an assortment.
Look at the specs near the bottom of the eBay listing:
2 Bit Gray Code That's probably correct. Two pins for the push button and three pins for the two phases.Continuous Travel That means there's no stops on rotation. That's probably correct.
Momentary push switch. You can test that by grabbing the center shaft with a pair of plier and see if it moves when you push or pull on the shaft.
20 position/pulses per 360 degree (rotation). Hard to tell from here. I don't know. I think 24 steps per revolution is more common. From the Reddit photo, it's the volume control. 5-pin, 3 pins for the 'code' and 2 pins for the push switch. Yes, that's standard.Supplied with nut & washer No clue on the thread type. Metric vs imperial?? Probably metric.
Rated Voltage: 5v DC That's ok.
Conductor: min. 0.5mA max. 10mA OK.
Operating temperature: -10°C~+70°C Just fine.
I can't be sure if the eBay part is a suitable substitute but is seems likely. If you have time, buy 1 or 2 and see if it works.
Note that the "11" in EC11 means that the base is 11mm x 11m. You should be able to measure the broken encoder with a rules.
Also, I think the Alps Encoder Product FAQ might be useful:
This is there selection of EC11 encoders:
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