Easiest axis/Vegas mod. One tool, three minutes
I had forgotten about an incident until someone here said to do this mod.
I lost the wiper arm retaining nut on a new silverado at 11,000ft in a snow storm. No drivers side wiper. It didn't fall off but it wouldn't engage the splines so it just layed there.
Do this mod.
There is nothing on that silverado, nor on my axis to keep that nut tight.
The nylon insert in that new nut will not let it back off.
Take the current nut to the hardware store with you to ensure the new nut size is correct.