Here is the ball bearing support for the layshaft with retainer that doubles as the shift shaft bearing block.
It saves using a retaining ring and also shortens the shift shaft which is made from 17-4PH hardened stainless so a little cost savings there too.
I looked at the Nova site and they list two close ratio gearboxes but the links which presumably say something about the ratios are broken. I was somewhat surprised that they also are using a high gear bush rather than needle bearings as Quaife used on the T140 gearbox.
So mine differs from the rest in having essentially stock range of ratios.