Well success - my initial insight seems correct! The nylon slider is mounted in a upside down U shaped metal holder and this is held by three bolts to the motor unit. So I just have to get to these bolts - and a magnetic screwdriver should be able to do this (I just checked) with a normal one - I just have to be careful not to drop the bolts!
So tomorrow when I should be feeling a bit more healthy I will give it a go!
Thanks all,
Matthew
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