Why not? I get the blame for most things. 
As I say, it is your decision Steve. Personally I would buy a replacement mandrel shaft that fits the mandrel saver so that I could always be able to use the mandrel saver with any of the mandrels from the major suppliers without if flapping around like a pair of Anne Widdicombe's knickers. However if you are certain you will only ever use it with the oversize TB shaft then go for it.
There, I have said it so you can blame me. 
Or you could throw the whole lot away and turn between centres like a grown up. 
