Found them!

These look like the direct replacements I need, and do come with the option of the M8 threaded stem!

And such an obvious website too (bookmarked). I will get the office to order a couple of buckets full.

https://www.castors-online.co.uk/product/65mm-floor-kind-office-chair-castors-4464

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I am looking for replacement castors for conference tables. Anyone have any good supplier site I could look at please.

They need to be like this, about 70mm tall installed, but with an M8 threaded pin. and not silly money as I will be sourcing possibly 40 of them.

Any pointers will be much appreciated.
Thank you.

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What rechargable batteries to use for a project outside that gets temperatures in the range of -7°C to +25°C?

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I have an Arka notebook computer, I use it for work to save me writing on paper.

The battery has decided it wants to go flat after about an hour. The power supply is 12V at 2A, but it's not convenient to keep plugging in as I am walking about.

If I got one of those lithium car battery jump start units could I run it from that?

Or if I got a 5v to 12v booster could I run it from my usb power bank?

What would you suggest?
Thank you.
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What do people use to make panels for projects? I have some aluminium 250x160 panels that I've just drilled holes, etc in before, but my latest one has rather a lot of cut-outs required, so I'm wondering about using a service.

I have the panel "design" in terms of edge-cuts and silkscreen layers in KiCad at the moment...

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