Been there, the answer is no, as you suspected.
Why do you want the smaller axle?
Next Q.
Would that spinder fit onto a complete 3d crank? Or are they different spiders.
They are different spiders, the 3df/3d+ one won't fit on a 3d one. I accidentally tried this last week, as I picked up the wrong one and it was obvious immediately.
@skinny started
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Been there, the answer is no, as you suspected.
Why do you want the smaller axle?