Update:
I have sourced a basic metric tap and die set and one x metric 6mm left hand die. Also some mild steel x 6mm rod. Have cut rod to length, as near as 10cm (100mm) as possible and generously threaded both ends at least 20mm from end of bar.
Now to refit.... I have checked and double checked that there is no cut out, or, exact match, on the gearbox spline, to the rod linkage bracket. I can orient the rod linkage bracket (the bit that connects to the spline of the gearbox) anywhere I like, but I have found that I need to keep access to its locking bolt clear, so this literally dictates where to situate it on the spline. The open side of that pinched spline connector is between 5 and 6 on a clock face, looking towards the back of the bike. Too far either way and I cannot get any access to lock the bracket off, on the spline. So, that's decided. I have found that I need to keep the access to the locking bolt clear, so this literally dictates where to situate it on the spline. Yes I am repeating myself.
To the other side of the bike. I have refit gearshift lever, loose fit for now because I'm having trouble bringing both heim connectors towards each other to enable me to insert the rod and thread them up, AND get correct pedal height of the gear shift pedal.
Q. Does anyone know if this has a torque setting - the gearshift lever mechanism - to frame, nut and bolt, that also holds the wire frame for the various rubber, down pipes, from the engine area?
Whilst I can guess, from my own pictures, how much either end of the rod gets threaded into the heim connectors, can somebody please clarify.
Q. Is it okay to take up all, or, any of the slack, in the gear box spline?
I'm sure the answer is right in front of me and with a little trial and error, I'll pop it on in a jiffy, but it would help to know the answers to the above. If anybody happens to know.

I know that adjustment to gearshift pedal height is easy when it's all connected, but that is where I am at, having trouble getting it connected!
If anyone would like to say how they would go about doing this, feel free to express any idea. My mind is open! Cheers.
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