I found a serrated knife in the garden shed which was just up to the job of cutting (sawing) through this thick wool carpet. I remember years ago I used this knife which was a 'honey knife' it is used to gently saw off the wax cappings at the top of a comb of honey before putting them into the spinner to extract the honey. One day I would love to keep bees again, but it is not always a terribly social thing to do when you live in London!