JMOR's diagrams are on the n tractor club site. This site does or did not allow links to any site that was deemed to be a competitor, so if another site looks like it sells parts, it will get blocked. you can easily locate the n tractor club, and add this to the address: /howtos/pdfs/JMORs-Wiring-Pictograms.pdf
There is no actual neutral safety switch in a 2N, and it is not shown in the diagram. There is a plate with a hole in it connected to the shift lever. The starter button operates a linkage that operates the starter switch, which is the can below the battery that looks exactly like a solenoid. The small picture of the starter switch does show a small shaft in line with the button pointing down and to the left. There is a plate with a hole in it located just below the end of that shaft that is not shown in the picture. When the shifter is in neutral, the hole in the plate lines up with the shaft, allowing the button to move. When it is in gear, the plate has moved so the hole is no longer in line with the shaft and the plate prevents the button from moving. there is one image showing the plate which is blocked by the stupid swirl in the image below. This link seems to open it without the logo:
cutaway
A neutral safety switch has to be operated in some way by something inside the transmission. A neutral safety switch has to sense the position of the gear shift lever in some way. Somewhere there has to be a mechanically operated switch that cuts power to the starter solenoid when the tractor is in gear. So you are saying that you can be sitting on the tractor with the trans in gear and the clutch pedal pushed down and the starter will not engage when the ignition is on and the start button is pressed? I would like to see how that switch was installed.
You may have to forgive someone who has patiently answered the same questions every week for 20 years and gets a little frustrated when someone like me comes along and asks again. I got scolded too, by people I have since learned meant well. I don't read every posting, so when someone comes along and expects me to know that their tractor is not wired normally, I have no way of knowing what they are talking about. You can't expect someone to look up a whole raft of your previous posts to study up on your problem. You have to describe the problem adequately.