Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Critical design weaknesses

Like a previous reviewer, my initial impression was that these were well made. Upon closer examination though, I found that the slides are solidly built but the design of the mounting rail is very flimsy. There are two tiny tabs that hold the entire weight of the drawer and slide to the mounting rail. My slides are the 22" model. The first pair I installed (replacing the slides in a pantry cabinet) immediately bent the tab and collapsed. I too am now in the midst of figuring out how to modify the mounting mechanism to be able to use the other four pair of slides I had bought for this cabinet. They might work if I turn the slides upside down and swap the left and right sides. That would put the mounting rail underneath the slide so that there is much more support area, not just the suppport of the tiny tabs.