Gantry binding/clunking at specific height

Sovol SV08
1

My SV08’s gantry seems to bind or hesitate and make a clunking sound at a height of around 15mm. I don’t see anything stuck to the rails or anything. Any idea what I should look for?

2

After watching the video 4-5 times, it’s sticking at the left rear corner…I have it circled & a line going to the screw on the back rail. It might not be this screw, but it does catch something when that screw is in the middle of the gantry. So concentrate on the rear left corner.

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3

I focused in on that back left corner, and it turned out the screws holding on the back of the enclosure were just a bit too long. I swapped them out with some shorter ones, and the binding is gone!