How to fix stripped 17mm wheel hex?

[Patrick]

Originally Posted by brushlessboy16

I dont follow.

In the second picture you can see the screw head sticking out of the hex and through the slot in the rim.

If you are using wheel hub/hexes that have no extension, you can use a longer pin that holds the hex to the axle (drill bits work if you can't find the right pin). The part of the pin sticking out of the hex goes into the rim to do the same job as the screw aqwut used.
If you are using extended hexes then the pin will miss the rim and you would have to drill into the hex like aqwut.
Even if you slot the rim to put a srew or pin in personally I would still use the epoxy for extra strength.