😯 😯 😯
sorry but the reversed cone bushing makes no sense : you loose stability, rebound an precision when turning.
barrel offers stability and limit the lean. normal cone offers more lean, less stability and less rebound. reversed cone offers more lean but that’s all. a softer normal cone will offer as much lean + stability and rebound. a smaller barrel bushing would also be a better solution than a reversed cone.
hourglass bushing is all but new. all Holey longboard trucks are stock equipped with hourglass bushings :
For any truck, the upper bushing must be softer or as soft as the lower : it supports more efforts + assure most part of stability. the upper assure the rebound + a small part of stability.
The only interesting thing I see ist the flat washer which assure more lean without losing stability.