Can't find it but basically got a mate to help me (he is decent with this kind of stuff)...
Cut out he handle using a saw (we used a circular saw which wasn't ideal but it did the job)
Put in the new handle, take it out and plane if need be so it fits well (make sure you are not forcing the handle too much or you will split the bat)...once you are sure about the fit apply good amount of glue and fit the handle...
give her 24 odd hours to dry...once dry I just used a handle plane to make the handle flush with the back and front...didn't use twine but hockey tape instead and it was fine...