This section describes the construction of one of the two bogie subframes.
Make the two main longitudinal folds, each of which is in three parts carried over the transom
sections under each axle slot. Ensure they are at a true right angle and reinforce them with a fillet
of solder. Take care to ensure that the region immediately around
the subframe bearing slots, for at least about 1mm around the edges of the slots, is kept free of solder.
Remove the four spring seats from the etch. There are two of each hand for each bogie.
Make folds 1, 2 and 3 in each spring seat as shown.
From inside the subframes, fit each spring seat through the slots in the side of the
subframe between the centre and outer axle slots.
The back of the spring seat should come up flush to the inside face of the subframe side.
Solder each spring seat in place, ensuring that the slots for the springs themselves remain free of solder.
Make sure that the seats are as far down in the subframe slots as they will go. Check that they are all
at the same height by inverting the subframes and resting the tops of the spring seats against a
flat surface.
Remove the two baseplates from the fret. Make the folds at each end of each baseplate, to about 80° rather than a full right-angle.
Fit the baseplates into the subframes, noting that the lugs on the sides of the baseplates engage in the recesses in the lower edges of the subframe, and solder the joints between the two.
Remove end stretchers from the fret and clean up. Fold the two outer lugs first then
make the inner folds together. Fit the stretchers across the subframe ends and solder up.
When fixing the stretchers to the subframes, it is convenient to work with the subframes inverted and the stretchers supported on heatproof blocks.
Fit the end plates across the subframe ends; support them against a block and solder in place from the inside.