>>673895With those 3500 boxes tho, I would definitely have to do some custom modification. They all have the 3 long rows that you can divide. But the rows are only around 1.5" wide so it would be impossible to get a regular spinner bair in there. Even some cranks would be difficult.
In a couple of my 3700 boxes, I just took the Dremel to it with a little cutting wheel. Worked pretty well once I cleaned up all the edges. But that was mostly to deal with larger packages of PowerBait and stuff. Spinner baits still fit in the regular 3700 slots.