I'm having a little trouble with your question and The_Joe answer. Generally bicycle chains are designed around a way to join them. Some come with "master" or snap rings and some come with special pins. Chains today rarely allow you to press out a pin, put the chain ends together and then press the pin back in. If your talking about using an aftermarket link they usually work very well. I normally use whatever the system is that comes with the chain. Single Speed chains usually come with master links that are of equal strength of the rest of the chain; if your source says not to use a master link with a SS chain, how are you supposed to connect the ends?