You can't open a block in order to make an attachment? Well, give the dog a bone to go with its LOUPS. Chances are, if you were charged with coming up with a name for this little invention, you would have chosen one that fits its visual description and it would have been ﾓdogbone in.
A Dogbone is a pin that joins the LOUPS to itself. (LOUPS are ready-made soft attachments that replace heavy stainless steel shackles on racing and cruising boats.) This Dogbone complements the 3144 LOUPS.