I haven't seen the fitting method that's to be used in this new Metso model. For a related subject, please see my response to a previous question regarding non-backed liners with metal-to-metal fits.

Some attempt at metal-to-metal fitting is likely being used with this new Metso model. The old Symons/Nordberg Gyra-Disc crushers were the most successful run of crushers with metal fit mounting. However, they were relatively short and had flatter 25-degree seated parts. The longer the parts become, the more difficult it is to maintain tapered fits. Maintaining the quality of seat condition in the crusher itself becomes something to consider as well.