Doesn't it come off like this one on the X4 with several screws?
How did you come across a G1 in the UK anyway? Aren't they an overseas market machine?
I thought it would come out that way, but it doesn't seem to want to budge. I don't want to force it and I can't see any screws or anything that holds it in.
I got the machine from Germany some time ago and it's not under warranty any longer as it is over five years old.
I've added more images to show what is not moving. So when I tug on it or push it from the bottom the right side (when looking at the machine face on) moves, and the bottom left moves. What doesn't seem to want to move is the top right corner. it just will no budge, I thought the rear wheels may be screwed into the base some how so I removed them but that still doesn't want to make it budge.
The only difference I can see is the front left corner which is the adjustment for the movement up and down. Again I disconnected this and removed the spring. Still the top left does not want to move. There are no other screws from below.