|Front view of heart...can you tell the difference?|
The ORJ isn't meant for chains, its really meant for patterns where the rings are concentric. Basically you join the outside ring to the inner ring to hold it in place and ends up looking like a slice of onion. Hence the name onion ring join. It has its own little foibles so I leave it up to you whether or not to use it.
|Picture from http://www.georgiaseitz.com/2002/onion/onion.html|