It slipped under our radar somehow, hence the late reply.

They can be a bit slow to adjust sometimes. But as you have done already, a new brushroll cures 99% of height control issues.

As it's only 15 years old, there's another decade or two in it yet. The Sebo we use in the showroom is from 1986. 

Hello Dyson Tech,
thanks for the reply. OK, hear what you are saying, and I bow to your greater experience here, so I will stop worrying about it and continue to use my ~ 35 year old carpet washer/vacuum cleaner as it is.
If only we still made such robust items nowadays.
Regards

Most people do away with supressors altogether nowadays.

Modern electronic devices, such as TVs and computers, are designed with built-in safeguards to mitigate interference from other appliances, including those that may emit electromagnetic noise like older vacuum cleaners.

These devices typically incorporate shielding and filtering mechanisms to ensure proper operation even in environments where electromagnetic interference is present. Additionally, stringent EMC regulations and industry standards require manufacturers to design electronic devices with robust immunity to interference from external sources, including household appliances.

In the context of your situation, where you've observed that bypassing the RFI suppressor in your VAX cleaner hasn't resulted in any adverse effects on your household electronics, it further reinforces the notion that modern devices are generally well-equipped to handle such interference.

If you bought it used, I am wondering if someone has used older parts on it.

The X7, doesn't have the feature that X4s had whereby you could stop the machine reclining totally flat. They all recline totally flay by default.

Look at the back of the machine where the pedal is, can you see something physically stopping it?

No, the 'Sweets' were white card with your parts supply logo on them :)

I didn't find a solution to this problem, unfortunately when it comes to electronics (I think they must be at fault somewhere) I'm stuck).

The next problem I want to solve is the battery replacement in the Coralle straighteners - I will create a post on this as soon as I have the device in the shop.

I'm sorry that I didn't have netter news on this.
Nik.