[folivier]

As my memory comes back, when extending my slide from inside you could see the top of the slide lift up slightly when the tabs were correctly engaged. If not it would drop slightly.
We were in Canada when this happened and it was a couple months before we were able to get to Newell. So we occasionally weren't able to extend that slide. I didn't ask Newell what was their fix since we had a few other things getting fixed.