
While chop sticking away on my lunch yesterday, I got to thinking about how to do these springs. Chop sticks won't work.
Perhaps tweezers, to compress the springs... nope, even them's too fat.
Finally cracked it though.
Don't insert the bottom bolster before trying to get the springs in. Turn the bogie/truck upside down, insert the springs into the hole, and leave them leaning in towards the centre. Then, carefully offer up the bottom bolster to the springs, getting them to line up with the recesses in that piece. Squeeze down, and thread bottom bolster through sideframe until it settles where all good bolsters are supposed to settle. Job done.