My sons 2016 125 petrol tap is leaking between the tank and petrol tap. I put in a new o-ring seal in but the screw inserts are rotating in the tank. So it is still slightly weeping fuel. 

Does anyone know how to remove the inserts and / or stop them rotating?

Cheers

Thanks Oni. Looking at tinernet where to get anaerobic bonding adhesive and they seem to be metal to metal bonding, but this is the metal inset into a plastic tank. Would this still work?

So I've given it a go. Let's see if it holds for the weekend. The insert didn't turn, but I tighten it too hard.