Hi folks,
As promised, here is the final result.
I contacted C&M Domestic Appliances and spoke to a very helpful lady. After she had discovered that I was using the wrong term – it should have been “Basket Wheel Support”, or possibly “Castors” – she then confirmed that the wheel sizes were indeed the same as my one remaining original. I then orderd two sets as I needed four wheels, on the expectation that I would be able to easily transfer the new wheels onto the existing support bracket. The photo below shows one of the items I ordered along with the old wheel.

Unfortunately, I foumd that the wheels were not easily removable, and there was no indication as to how they were fastened on. A quick trip to my daughter revealed that the support bracket was also wrong. Incidently, on another website, there was indeed a set of components one of which looked very similar to the support bracket on my daughters machine, but there was also a note warning people to be very careful as removing the bracket would involve the loss of an additional plate between the inner and outer skins of the dishwasher thus making the job somewhat more difficult. A final consideration was the cost – the kit of parts was around £18, or £36 in total, whereas the bits I bought were only £6.18 each.
In the end, I decided to deliberately break one of the new pieces. First attempt was to see of there was a push in piece holding the wheel in place. Heavy hammer and bar resulted in the stub axle breaking off – see photo below. Next, I attacked the wheel with a junior hacksaw and this revealed that the wheel was held on effectively by a flexible plastic lip on the inside of the wheel which locked into place over a matching protrusion on the stub axle. See the drawing which shows both the old wheel, and a new wheel. This also showed that I would have had no chance of making new wheels
as I don't have a narrow enough tool to create the gap, about 0.5mm, between the lip and the wheel body.


Note the difference between the old wheel on the right, and the new wheel on the left.
So, having found out how it located, I then drilled out the stub axle on the second wheel until it came free, compared the broken stub axle with the existing, fortunately the same, placed the new wheel in position, pressed hard and with a very satisfying click, the wheel locked into place. Job done.
Of course, having deliberately damaged one of the new wheels, I then had to buy another set, but at a total of £18.54, I have satisfactorily repaired a 25 year old dishwasher.
Final comment. My daughter, says that she is going to tell the owner what I have done on the grounds that it shows them to be good responsible tenants. Hmmm, I do hope she isn't letting herself, me(?), into more jobs around this rented property!
So there we are, job done. Many thanks to all who contributed.
Regards,
Peter G. Shaw
Edit. How do I change the text size? The original pasted in from Libre Office Writer which is effectively the same as Word, but on the forum, was quite large, yet on the original,was reasonable. In the end, I have had to resize in Libre Office and then copy and paste again.
Edited By Peter G. Shaw on 01/10/2014 11:55:09