We’ve tried to use some High Strength Shafts, but find that the very end of the shaft has a small ‘egde’ or ‘rim’ that prevents it from fitting into the v5 motor or going through the larger hole in the middle of the Gear.
You can file that off. If it has been previously cut, then you can just file off that edge, and that should fix it.
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We have seen that also, we use a file or dremel to shave off the tiny ‘edge’. Then it fits perfectly, even able to easily slide the whole axle through the gear.
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I always file and sand down all of my shafts after I cut them.
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Suprisingly, High strength Axles are very easy to file and grind down, Heck one time when I was lazy I was able to tin snip the edges down(But I would not recommend because you may cut yourself). If you don’t have a file, just flip the High Strengh Axle so the cut portion faces away from the motor.
I do the same. Doing this should fix the problem.
There are two sizes of HS shafts. No one knows why. One size can’t fit into motors and has friction on the bearing flats, the other works perfectly.
That is why I always drill HS bearing flats out a millimeter or so larger. 
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