Originally Posted by
squirtdad
it is not a one piece crank it is a cottered crank where the crank arms are led to the spindle by cotter bolts parallel to the spindle
Then you are in luck. A square-taper bottom-bracket spindle will swap right into your bike and allow you to bolt on any square-taper crankset you want. Or you can wait to find replacement parts for your bike that match the originals. Put up photos of your current equipment. I think I have a few extra cottered crank spindles in the garage, also I have a set of cottered cranks I think are in good condition, and lastly I have a stock of new cotter-bolts, maybe in two or three different varieties. Different countries used different standards for their cottered cranks !!! I respect the history of the cottered crankset, it was very popular on bikes for decades, and before the square taper design became popular it may have been said to be the "high-end" type of crankset.