Heim Joint Shift Linkage Installed - Locknut Question

I just installed a shift linkage with heim joints. I've got it adjusted to the same length as the OEM linkage. On the back end attached to the lever coming up from the transmission, I've got it secured with a button head bolt, blue lock tight, tightened down snugly. On the front end, I'm using another button head hex bolt with a nylon lock nut.
Here's my concern: if I tighten the front nut down snugly, it causes the shifter arm to bind against the heim joint, and it will not allow the shifter to snap back, ready for the next shift. I have move the shifter up or down with my boot. If I back off the lock nut, so the bolt is spinning freely inside the heim joint, all is fine. (I think this is how the OEM linkage worked with the acorn nut snugged down, letting the ball joint spin freely under the rubber boot - but, I'm not sure - I didn't pay that much attention to it when I took it off)
If I leave the nylon lock nut "backed off" so the bolt will spin inside the heim joint, will it stay in that position, or will I be stranded on the side of the road, fishing a zip tie out of my tool bag after the lock nut and bolt have bounced down the road?
Is that the whole purpose of a nylon lock nut? I know it's a simple question, but I don't know the answer, and I'd rather appear ignorant here than have to do a roadside repair.
Thanks.
Maybe there's something wrong with the heim joint then? The ball inside the heim joint doesn't move freely anymore, that is after installing. It did prior to tightening the bolt down. To make the ball inside the heim joint move, you have to stick something like a screwdriver through it and pry it in the direction you want to move it. I didn't crank down on it very hard though, when tightening.
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