How to attach threaded rod

[Plupp 433451]

Absolutely, also the suggestions above, i.e., anything that increases the friction higher than the hex nut.
Bearing lock also works, but I found it unlikely that TS has this if he doesn't have thread locking.

Can also be done with fabric.
linen, thread fabric, etc.
I've learned condom...
On a Volvo 240...oil tank cap tightened with condom...

 

[SimonZ]

Thank you for all the great answers!

 

[Plupp 433451]

Thanks for all the great answers!

avoid the last one

 

[useless]

Have you thought about cutting the rod, or should it stick out as it does in the second picture? If it should/can stick out a bit, you can put two nuts at the end of the rod and tighten them against each other. Then you can hold against there with a wrench when you need to tighten.

 

[SimonZ]

Are you planning to cut the rod, or will it stick out as it does in the second picture? If it should/can stick out a bit, you can put two nuts at the end of the rod and tighten them together. Then you can hold there with a wrench when you need to tighten.

I will cut it, but there's room underneath, so I can definitely cut it and make space for two nuts. Great tip!