My 2017 29.3 ACE, I beleive may have the same door set up. In mine the leading door has the locking parts to keep them open. The trailing door at the bottom leading edge is a piece that is screwed to the trailing door. That piece then has a small pin that follows a cut out track in door one. If that makes any sence to you. I am having a problem (on second set of doors) with the pin coming out of the track and the trailing door slamming into the wall thus damaging the door. Hope this helped.
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