craig_whilding wrote:Two methods I can think of -
1 - You count the bearer the bogie is pushing against as an axlebox and attach it to the CSB and provide it with hornguides.
2 - You tap a tube for a screw in one end and a coil spring in the other and allow the height of the bogie to be adjusted finely by the screw but this is still effectively independent of the CSB. The pivot would need to be a tube on the bogie outside of the body tube with the spring in.
Spot on I should have said, but I didn't want to comment at the time as to do so would have been to give away the plot of what was to follow! So now you can see I considered both of these approaches but ended up doing something different.