Ensure that the housing for the brush bar is at 90 degrees to the handle (i.e. what would be standing up position if the vacuum were on a floor), otherwise accessing the recessed screw is difficult/impossible.
For that smaller rubber piece, take pictures and note that it goes on one way only. The two lobes are not the same size and if you get it the wrong way round, it won’t fit properly back into outer casing when you put the motor back in. It will go in, but not be seated properly and likely won’t seal correctly.
Thank you for the guide. I just replaced mine. A lot of bits when disassembled, but goes back together relatively easily. Satisfying job knowing the saving.
Note wiring colours for reassembly as the connectors are identical. Red to brown (live) and black to blue (neutral).
During reassembly, you will need to work the edge of the larger rubber seal on to the motor lip. It needs a thin flat blade or similar to lift the edge over, work all the way round. It took a couple of passes in my case to get this seated properly.
Also take note of the positioning of this cover before removing. Take photos or consider adding an alignment mark to ease reassembly.
The larger piece of rubber is the motor fan case seal. It has a lip which grips the motor. So work around that largest circumference easing the lip back from the motor, then the seal will pull away from the motor ok. For the smaller seal on the other end, make a note/photos of how it attachs to the motor as you remove it to make installation on the new motor easier. In the pictures here it’s fairly obvious, but on mine there was more than one set of holes.
I guess it doesn’t matter if you know your motor is dead and will be replacing it, but…hitting with a hammer was not necessary for me. Just push with both thumbs either side of the belt shaft and it came out no problem.
A tip I saw elsewhere was to disconnect wire from handle switch and feed wire through so that the motor assembly can be pulled out of the machine as a whole. Not hard to do and may make things a bit easier. My wiring was connected with a push connector on live on the switch and an uninsulated spade connector inside a black plastic cover on neutral.
Two flat blades may work better here as the cover tends to pop back in as soon as you move the flat blade.