you can also get a cutoff blade holder for most tool post
I have one for a can at work , loads more rigid than a separate tool in a
tool block , and it frees up the tool block for something else, the cutoff
blades all fit the same holders just about check here

http://www.mscdirect.com/mscProductS...1&Merchant_Id=
1&query=79046561&search_cat=5