[Help Thread] Help, one of my hex nuts fell off of my Qiyi Clock

[Exvictus]

I was cleaning my Qiyi Clock since one of the pins was feeling a bit off, but when assembling, one of the nuts that help it stay closed fell off and I can't find it. Does anyone know the dimensions of the nut for it to prevent it from falling apart?

 

[UncleFrank]

Some people take all the screws and nuts out permanently and just use tape on the sides to hold it together. Less pressure on the dials so it turns a lot easier.