My dad made a new post for Jack a year ago and all he used was sisal rope from a DIY shop (about medium thickness) and glued it on with a non toxic glue. If you look in your local DIY store (hardware store I think you call them) you should be able to find a glue that will do the job and also get one that is safe for animals. Just ask the person who works there. I'm pretty sure you should be able to do it very easily, and it's also much cheaper.