Hmm, the wheel is smaller? I was pretty sure that they used the same size wheel on all of their basses.
Anyway, graphite is your friend. I had this same issue when I got a new stingray 5 bass. The wheel would not turn. I even broke a screwdriver off in it. So, instead of tightening it, I loosened it, and put graphite on both sides of the nylon washer that is between the nut and the neck.
After that adjustments were smooth sailing. You can also loosen the strings a bit to make it easier for the wheel to work.
2007 Stingray 5 HS Cherry Burst / Maple FB / Ceramic Pickups
2012 Stingray 5 H Pearl Blue / Rosewood FB / AlNiCo Pickup
2012 Steve Morse Morse Blueburst / Rosewood FB
2012 Luke III SSH Vintage Sunburst / Rosewood Neck
2021 Stingray RS Pacific Blue Sparkle / Maple FB
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