I've got a catchcan installed here, as per pic and I want to plug the top and the bottom parts where the sight line holders screw in.
Now I took the little black holders to mitre10 so I could just get the right size/thread bolts and plug them that way. But despite the bolts matching the black holders thread/size they do not screw into the catch can.
So what can I use to plug these things up? I was thinking of some sort of rubber stopper but I have no idea where to get something like that from.