Originally Posted by
cornclose
Got it out without removing anything else - made a 'special tool' as shown in some of the above links.
The reason that it kept popping out was because the long spring had become dislodged and was blocking the mechanism from catching properly - hence it wouldn't close. The spring was dislodged because the plastic tang that holds it at the front had broken, so I drilled a 1mm pilot hole and replaced the tang with a very small self tapping screw, a good strong repair which is totally invisible.
Whilst at it, I also repaired the clasp mechanism that holds the cup. The ratchet wire/stay was a little lose and wouldn't engage with the plastic slots properly. A blob of Araldite to hold it in position sorted that!
Cheers all.