Producing kits - much like a lot of other aspects of modelling, I suppose - is a continual process of refinement.
Customers who buy the NG-Y ballast wagon kit will find there has been a welcome redesign of the fold-up brass bogies.
The middle section along the top has been narrowed ever so slightly. This has the effect that the shouldered brass bearings can now be fixed flush inside the bogie, rather than having to be left sticking out a little to retain the wheelsets in the optimum position, as in the first generation of kits.
This should make an already simple and robust design even easier to assemble and my CAD design genius at Narrow Plant and I hope that builders will appreciate the change.