Buffers and couplings

 

Slightly fiddlier big bits this time. A certain carpet-dwelling YouTuber would be delighted to find the buffer are sprung. But you do have to assemble them. 

Here, I found a little work with reamers was needed to ensure the plastic buffer head and shank slid freely in the casings. Nothing more than a couple of twists, but worth it as they won't "wear in" in operation.  Not unless you push the things endlessly anyway, and that's not my idea of a hobby. 

Even with the other collar on the end of the casing, the shaft and spring will go in from the front, being retained by a metal nut on the back. I added a little superglue to this once assembled,  we don't want it unscrewing itself and falling on the track, never to be recovered. 

Coupling hooks just slide through the headstock, the spring goes on the back, and is retained by the split pin. This slides easy though, and is a little bit fiddly to open up so it stays in place. A two-plier job.