Tim, I forgot to mention something crucial, Not sure about Epoxy to fit Return Crank, but with solder you have to cut the crankpin shorter by about a 1 to 1 1/2 MM from the top of the flange on the bush, Then take the bush off and cover the crankpin in felt tip pen and a very light oil. This will stop any solder running onto the crankpin and seizing it up, I did It and it bas@tard to put it right.
HTH
John.