I think that I am doing this right, although something is clearly off. Maybe I'll be able to post the images by the time this discussion is over.
I've got a triple Custom crankset off a 1971 Univega that I am trying to make this work with. A longer spindle may clear this frame, but it will not with the current one, which looks like it was set up for a fixie. What size did you use on your 610?