I'm really thinking of ordering a connex quick link. People are saying you shouldn't use a new masterlink on a used chain, so I'm worried about putting a new connex link on my existing chain which still has heaps of life left but is not new. What do you think? Why can't you use new quick links on used chains? If you damage or bend your masterlink, then you have to replace the whole chain with the quicklink? That sounds hurty.