What's the best way orient the barrel link when reassembling the slide and frame? I've watched a bunch of videos and don't understand if the link should point forward against the return spring rod or should be vertical. If it's vertical, do you leave the slide upside down and slide the frame onto it? Do you then turn it right side up and move the slide back and forth a bit to allow the link to drop into the vertical position? Any good video you suggest? Any suggestion will be helpful.