This is what I did to remove the moving bits of the 1G auto seat belts to make them no longer move. I actually used to like them, but I'm making a racecar and the weight savings is too enticing. Sorry for the fuzzy photos.
Precaution is highly advised since this is safety equipment, also as such it's probably breaking laws to do this to a street car. Do at your own risk.
take out the seat belt contraption and take the 4 screws seen here
This little doodad below is a switch that pushes up on a flat pin to lock the belt. If you feel that this mod is unsafe then look at what this does, it's just a rod that pushes against a metal door to keep it from sliding. We're going to be welding the door bit shut so it could actually be safer.
Next we're going to remove this little screw on the side.
then slide the seat belt out the bottom. Then remove the metal band going from the motor.
pop out the metal trap door and the little clippy thing and you should have these parts along with the aluminum track.
take the track and cut the part that slides into the seat belt to where it's the same length as the holder.
Keep all this stuff below together! I originally took it all apart to get rid of unwanted stuff, but the plastic on the sides will keep the belt holder from going side to side. When it gets welded the plastic pieces melt to fill the gaps and will make it less sloppy of side to side motion than what it would be with the auto belts. If the plastic is removed the belt can move side to side, but it can't go forward or back so it's safe, but feels sloppy. I just took a pic of it since i had it apart.
The track that was cut off gets put back into the seat belt with the little hole matched up to the screw hole on the side of the seat belt. Take the screws that you took out in step one and start one into the side, but don't put it all the way in, just so it keeps the track from moving. Take the trap door and make sure it's in the notched slot for it and wedge a screw in between it and the side. Make sure it's not crooked or sticking out the top.
Put the seat belt into the slide and tighten the little screw on the side, it should all stay in place.
Then weld the trap door to the seat belt.
The original plan was just to weld the belt part the bracket that bolts to the car, but it would move the location and might not fit in the plastic interior or be at a wrong angle in a crash. I wanted it to be in the exact location the stock belt is supposed to be in. The gap is also a decent size to weld it inside the slider bracket which could be difficult. So there you go, no more choking and it's safe in the stock location.
now to just make it one latch instead of having to buckle twice....
