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@Andrew_H
Thank you Rosmal, I'll do a little Google searching for the bottom bracket.
Although, I just swapped the chainring to the inside of the spider and now have it down to 48mm. I checked the chain and still have tight and loose spots at different points of several revolutions of the pedals (forgot to mention this previously).
I'm not sure about the minimum bottom bracket width. These are the cranks in question:
http://www.velosolo.co.uk/lasco.html