Phots above show the two bogies. The one on the left has the damaged bogie frames, damaged by my artless soldering. I've now managed to release the Delrin sprocket from the axle, so that I can reposition the gear wheel centrally on the axle. I need to try to solder the ends of the bogie frames back on, which will be a test of my whitemetal soldering abilities. I have a spare set of frames, so I can make them up if I make a hash of the repair. 

Two of the bearings also came loose, so I need to solder them back in.