I ordered the gymnastic bodies ring set off the website. It doesn't come with any instructions on installation (or at least mine didn't). From a forum search, I see that I should mount them 50 cm apart using eye bolts. Please tell me, what size eye bolt? how do I attach the straps to the rings? What is the configuration? Is there a photo of this somewhere? (I emailed the "help" link on this website last week, but no answer). I have someone who can assist with installation on Thursday -