Hallo, As mentioned elsewhere, I bought and tried the Fiskars swivel knife for the Coluzzle nested templates. Since I still had some problems I read some back posts from 2004 on he topic where there was some interesting information ... and decided (after reading these) to try the Coluzzle swivel knife. It is quite the better one IMHO.
I'm now beginning to get the hang of this -- this knife works exceedingly well -- so thanks everyone for input and suggestions. Diana