I have found that I sometimes have difficulty backing off the scrubber nut on the Boris by a quarter turn so.......
I spoke to John Routley at narked@90 and he kindly made me a first class quality tool to enable me to do this.
See here:
http://www.narkedat90.co.uk/45.html
John many thanks for manufacturing a bespoke solution to my problem, you are a top man.
Cheers mucker,
Dave.