If not, detach it from the bellows tube. Twist the throttle cable around the cam so you can slide out the retainer. Then unclip the throttle cable from the throttle body bracket. Remove all sensor wiring harnesses, vaccuum lines, etc.
First you will need to remove the throttle plate. You will need a torx bit, a T25 I believe. It's best to use a bit and not just a torx key, since those screws can be stuck in there pretty tight, thought you may be able to get by. If you are swapping in an aluminum throttle plate from a 1gn remove it as well. Do this by loosening the screws, twisting the throttle cam, and sliding the plate out sideways. The plastic one only goes one direction though.
Next, remove the throttle position sensor.
Those two screws in the picture. Now with a little finagling you should be able to pull out the shaft. Be careful of the spring.
Cut half of the shaft off (hence half-shaft mod.) Make SURE you cut the side with the indentations for the screws already in there.
Otherwise you'll have to screw the screws in from the other side. I'm not sure that would work, and even if it did you'd have the screw heads creating turbulence. (note:if you're having trouble with seeing where the arrows are pointing, right click and "save as" to your desktop, and open it up with some sort of image viewer where you can zoom. The resolution's fine on it, it's just showing up small for some reason.)
If you want to get fancy, screw the throttle plate back on the shaft before you put the shaft back in so you can see how far the screw tips stick out and grind them down. If you do this, take the plate off again since you won't be able to get the shaft in the TB with it on. Replace the halfshaft (you may have some trouble with the spring, just make sure each end of the spring is resting on the little ledge reserved for it.) Now comes the tricky part. When you replace the Throttle position sensor, make sure that you have it oriented properly. It will go on slightly torqued one way or another. Make sure that you can work the throttle cam with the TPS on, or you've got it on backwards. If it's on right, it'll offer slight resistance, and if it's on wrong, it won't budge.
Now put the throttle plate in (either the plastic one or a new metal one) and you're done!
Note: I have the feeling I may be forgetting something when it comes to putting the shaft back in. Not sure what it is, but pretty sure it's a common sense sort of thing. Use your brain. On the 1gn throttle body there's a retaining circlip holding the shaft in place, but the 2gns don't have that. Not sure what they have holding it in place. If worst comes to worst and it's still sliding out, coil the spring and use the throttle plate to keep it from sliding out. I don't think you'll have to do that though.[/img]
