With respect RobertMP that was not the query.
is there any particular way to pass the end of the cramp through the slot in the roller thingie so that when you pull on both the release ratchets it will come undone?..easily
The way I do it is to hold the ratchet in the left hand with the attached strap to the left and the ratchet handle at the top. With the ratchet handle in the closed position feed the loose end through the slot from the bottom so the the end comes UP through the slot and pull until the strap is tightish around the job to be clamped. then use the ratchet to do final tightening. To release do as Robert suggests.
Hope this makes sense
John