The WFT 2 is the next generation of WFT trimmers. The two main improvements are the ability to trim up to 45 caliber and interchange trim chambers. The WFT 2 has a half inch shaft and requires a half inch chuck to drive it. The feature most customers asked for was the ability to interchange trim chambers. Instead of press fitting the trim chambers, like the original WFT, the trim chambers on the WFT 2 are a slight slip fit in bearing with a groove cut for an O-ring which creates a press fit. Changing out trim chambers is accomplished by removing the cutter and pushing out the trim chamber with the knock-out dowel that is provided. Installing the trim chamber is accomplished by setti Mfg: Little Crow Gunworks.