Product comes pre-assembled. As soon as I installed it and drove down the road, the plunger lock fell apart and one of the bolts holding the tray came loose. I reinstalled the bolt/locknut and piston and found that the bolts were not long enough for the locknut to work. I removed the screws and put in longer ones. The plunger keeps loosening, so I had to tighten the blue lock to hold it in place. It's fine, but be sure to check everything before using it. Still a good product to use in my trailer. I recommend buying it.
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