Thanks for the tips guys.:)
I'm using washers to push the cups below the level of the yoke surface as Langy suggested.
Following a suggestion from Scouse (thanks for the call Scott) I measured the gap between circlip grooves in the yoke (~74mm) and the end-to end measurement of the uni as it comes out of the bag (~82mm). Conclusion: there's no way that's going to fit without using a 50tonne press so I must have the wrong uni.:(
