I have just fitted the brass top hat assy in to the bulkheads, ready for painting, then installing in to the 47s body.
I had a little wobble of concern as the top hat was of a smaller diameter than its fixing hole in the bulkhead.
Anyway, DJH didn't answer my question regarding this, and said to solder it in, which I have.
The bogie end of the top hat (Journal?) was countersunk by Steph due to a very flat headed screw being utilised due to limited clearance in the bogie due to the cardan shaft.
So, the 1st photo shows the bearing, with quite a gap around it. No problem though as centred and soldered in place.
This end of the journal (if correct term) sits inside a bearing soldered in to the top of bogie, then a countersunk screw and washer hold the bogie in place.
Should have the all clear from the boss to order the decoder from SWD soon
