My own preferred method is to use a very long piece of tubing,run it from the bleed nipple over the seat unit and back down the other side into a container (old oil can). That way you can open the bleed nipple and leave it that way for any bubbles to rise, since the fluid will sink and stop air going back in.

You can leave it like this overnight and usually the system will have 'self bled' by the morning...
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