When I was at Lincoln, Darren Scott (DSC Racing) showed me a new layshaft built for AF Rayspeed by UNI.
It has more width to carry the loose gears. Ben obviously thought this was helpful when using the Clo5e five speed gearbox as it gives extra support to the inside face of the gears, especially the first gear. It does not appear to need any modification to the gearbox or the gearbox endplate and I guess it works as well with any four speed ‘box.
I think I am going to get one to replace my 50+ year old Innocenti layshaft.