The Workcenter WCR-1000 requires a CT-26 or larger to fit in stock configuration. To mount to an older (or newer) MINI or MIDI, you would need to fabricate some sort of adapter plate, which I think has been described on here in a thread somewhere.
Source: I have an OG MINI, a MIDI-I, a CT-26, and a Workcenter WCR-1000 and tried to fit it on all three, only succeeding in fitting to the 26.