Neiman 68 Steering Lock mystery hole

Hi Guys:
I just removed the steering lock from my M series Dino, left hand drive, and after inspecting it I see there is a threaded hole on the bottom side of the housing...it appears to be threaded to 6mm. When I removed it there was no screw in the hole and I am wondering what the function of this threaded hole is. Does anyone know what this hole is for? See attached photos. The assembly is a Neiman 68.
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Hi Guys:
No, I am not talking about the theft-proof screw hole which is also a 6mm threaded hole. See this additional photo. The hole I am talking about is near the end of the assembly and is oriented at the bottom of the assembly when it is installed in the car. As far as I can tell, my ignition lock assembly works fine without anything screwed into the mystery hole.
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Hi Gary:
Wow, it looks like you are correct...I have a USA E-series Dino electrical schematic and I do see those two extra wires going to the ignition switch. My car is a Euro spec M series car that was imported to the USA as a used car in the 1970s...do you think that this ignition switch/steering lock was original to my car and there was just a screw in the hole to plug it? I do remember finding some loose hardware on the floorboard of the car when I disassembled it and bagging/tagging the hardware as unknown and I have it in my stock...I will go look to see if there is a short 6mm screw that might have been in the hole and fell out at some point.
Regards,
Henry

 

Hi Gary:
Thanks again for the info...I went through my stock of parts and there was not a screw or plug that would have been in the hole. So I can move on with my reassembly of the car. You have my prayers that the earthquake yesterday did not do any damage.