Each slide mechanism is different. On the ratcheting type on my Roo, there was a single toothed rail under the center of the slideout. I was told to hold the button until it ratchets and then release it. I never had any issues with that slide. I've never had a Schwintek.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)