The dreaded Spider roof cover gear failure has struck mi motori, however I find this fix to be supper simple. A dodle as the brits say. Anyhow the plastic gear wheel used to lock the roof cover down stopped working altogether and was stuck in the closed position. Damn, luck the weather was good lately. Anyhow, the motor is stowed away in the storage comparement behind the seats. Pull out the internal coverings and you'll find the mechanism as pictured. You can either remove the negative from the battery to not damage your electricals with any shorts, or just simply unplug the motor as I did, up to you but the mechanism needs to be disconnected.
1 - Now the moving arm is held in place by the one nyloc nut. The design is so that if its broke and locked, as mine is, you just push in the armature and it releases itself from the gearing as its sprung up against it.
2 - Once the armature is in the unlocked position, lift the hood cover up so that the locks are exposed for later. The cable is attached via a simple two lock nut system. I think the lock nut is 8mm, once cracked it comes off very easy. Hold the sleeve nut with appropriate tool and undo the lock nut that is on top. Unscrew assembly and disengage cable from armature x 2.
3 - Now its time to remove the mechanism. Nuts 1, 2 and 3 (along with the armature nut) are all 10mm nuts from memory. Just remove nuts 1, 2 and 3 at this stage and pull the electrically disconnected mechanism of the three thread rods. It may be a little difficult to pull off as the threaded rods aren't exactly square. Just keep at it and dont be too ham fisted with it, it will come off.
4 - Once off, turn it over and you'll find a backing plate with 4 phillips self tappers. Undo and remove the cover. There's no sprungs to worry about which will fling out, the sprung force comes from curved spring steel plates.