This is a very convenient and versatile way to add movement to your aluminum profile designs. I did feel a few small bumps on my 2m ride, so I'm not sure how they will hold up. But the price is right, and I suspect they're the same as some wheel assemblies that sell for double the price. No long term experience yet. They come with screws and a very useful wrench. What they don't have are instructions. So here it is: The assemblies should roll perpendicular to the two elongated grooves on either side of the board. These slots are for ratchet straps that pull the cart left or right. You will soon see why this alignment is important. Two of the four black wheels are adjustable; You can move them closer or further to the opposite wheel to increase the wheels' grip on the track they're rolling on. Two adjustable wheels have hex nuts under the tires (the other two only have a round hub). Place the included wrench around the hex, turn the assembly over and you'll see the pan head screw move closer and farther from its opposite wheel, making an off-center circular motion. This is how you tighten and loosen your grip. The full range of motion from minimum to maximum is only one rotation, so tune in slowly. The wrench is slim, allowing you to make adjustments while the carriage is on the aluminum track. Here's a tip: to permanently attach the cart to the item (so the item can move), then drill a thread into the bottom plate of the cart so the hole is slightly larger than the size of the screw. That way you're going to put the bolt through the dolly into whatever you're attaching it to. By attaching the carriage to the rail with screws, you get a slide rail.
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