One inventory system in four generations: the catalog the shop had before, the tool written in a day to replace an outside vendor, what that tool grew into over thirteen years, and the thing running the company today. Two of the four open and run. Two are holes, and they say so.
What to look at. The row of column headings in the 25 May 2012 inventory frame, and then the two rim sheets five weeks apart in 2014. That is the whole argument on one page: the business is a question about which numbers describe a wheel, and you can watch the answer getting sharper.