Originally Posted by
rmfnla
You are mistaken.
Almost all plugs and caps are connected by an allen bolt and you can combine them as you wish.
But not all. The FSA plug uses a special top cap with an inside threaded collar and it has to be used.
There are other compressor plugs that do use a top cap and bolt like the starnut system and you could use your CK cap. Profile Designs makes one that should work.