Technical Soft top question

[JonPiz]

I’m just removing the soft top so I can refurbish the frame and put on a new cover. My question is what fixing is used for the end of the rear fixing bar. The hole in the body work seems quite large. Should there be a captive nut?

 

[Ant Knox]

It originally would have been a self tapping dome headed screw, but the holes often are rusted out.
I've heard of set nuts being used in their place.

 

[the hobbler]

It originally would have been a self tapping dome headed screw, but the holes often are rusted out.
I've heard of set nuts being used in their place.

I used "Riv-nuts" on my roof's cross-beam and then protected it with a heavy grease prior to re-fitting the cross-beam.

 

[telemike4]

I used M4 riv nuts I think. It worked well