Here's how to fit it...
1. Unclip gaiter from centre console. Remove torx screw holding centre console to gear bearing mount, slide the console back slightly then remove it.
2. Put the car in 2nd gear. Undo the four nuts holding the gear bearing mount to the floor (10mm socket).
3. Lift the bearing mount from the studs and turn it 90 degrees. Let the gearlever flop forward and you will now see the nut and bolt holding the lever to the linkage. Unfortunately you cannot dismantle the lever from the bearing mount at this stage so you will just have to undo this nut and bolt with the access you have (it's fiddly but manageable with a 10mm and 12mm spanner).
Now that the lever/bearing is out you have the choice of smashing this one up to leave you with just the metal shaft, or I'd advise you to get another one from a scrapyard (any Saxo/106 one will do - I paid £.
4. Remove the gearnob (this is a struggle, I'd advise cutting it off and getting another as you will not be able to refit it anyway) and remove the plastic grooves (white on saxo, black on 106) that hold the gearnob on (either with a stanely knife or smash it off with a hammer).
5. Unclip the white ring above the gear bearing and pull the ball out of the mounting. You will not be able to remove the shaft completely but this will give you enough access to smash off the white ball. The lever I worked on had a black rubber ball under this which I also cut off - some have a metal ball. You should now be able to remove the shaft from the bottom of the mounting.
6. Bolt your gearlever back onto the linkage - this will be much easier now with all the plastic and rubber out the way. A tip at this stage is to put some polyurethene grease on the bolt holding the lever to the linkage to avoid wear on the nylon bush. Also don't do this bolt up too tight or the lever will not pivot back and forward and make gearchanging impossible.
7. Take the rubber boot off the bottom of the old plastic mounting and slide it onto the gear lever and down onto the studs.
8. At this point I'd advise placing a spacer (max 5mm thick) on top of the rubber boot cut out the same shape as the bottom of the quickshift (any material will do - I used perspex but ply or even MDF would work). This will give you more room for adjustment.
The next bit will probably need repeated until you get a setting that suits your tastes and avoids the linkage brushing the exhaust heatshield.
9. Slide one of the collars on to the gear lever with the narrow bit upwards. Tighten it at a point just above where the plastic ball used to be.
10. Slip the quickshift onto the lever and down onto the studs and bolt it down (not too tight in case you need to adjust the lever throw). Slide the upper coller on with the narrow bit down and then get a mate to hold the lever tight upwards while you tighten up the coller - this avoids any loose up-down movement in the lever.
11. Once you have a setting you like, tighten up the four nuts holding down the quickshift, fit a gearnob, and drive off for quicker 0-60s!