58 front sight issue

[Somerset Bar]

I have a CSA vz 58 that was NIB. I noticed at the range that it looked like the front sight had been hit at some point, one of the ears was bent and the post had quite a yaw to it. Anyway, I removed the threaded post and hammered it out, but noticed that the barrel lug it screws into is quite loose, and the post can shift back and forth when it's all put back together. Is there a good way to remedy this? I would just wedge something thin in there, but obviously the barrel will get quite hot with use so not sure... so I thought it might be worth asking here. ?

 

[bfiles]

Sight it in then put a dab of nail polish on it. Should hold it in.

 

[Somerset Bar]

Will that really stand up to the heat of the rounds? Pretty simple fix if so