Having determined with help that the missing final drive gears were MOD 0.3 and that MOD 0.3 is a bit fine for 7mm models I bought from Chronosa set of MOD 0.5 gear cutters.

I also bought a single MOD 0.3 No5 cutter which will cut 26-34 teeth from a company in Japan called Gavan Tools but no great surprise that once despatched and I started tracking it, it was coming direct from Shanghai China. That said, the tracking information provided was excellent and it arrived safe and sound.

This is the same image with a little more contrast to all you to better read the details