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A tip from Colin Woods:
If you have the standard Murvi toilet roll holder, you no longer need to suffer the indignity of rescuing the loo roll from the floor after every journey. A short length of siphon tube cadged from a home brewing friend to bridge the gap will do the trick. You will need to soak the end of the tube in boiling water before sliding on to one plastic arm of the holder and then cut the tube to just meet the other arm. This secures the non standard cassette-friendly toilet roll but still allows easy replacement when the time comes.