The latch (or clamp) is adjustable for all Vilano folding bikes!
The latch needs to be tight while you're riding to ensure the frame is secure. If you do need to make adjustments its very easy.
Extend the latch so it is all the way open and look at the latching mechanism. There is a center bolt (that connects the frame and the clamp) that can be tightened. When the bolt is extended (loosened) the whole latch gets tighter, if the bolt is shortened (tightened) the latch gets looser. You should be able to twist this with your fingers, but you may need to use an adjustable wrench to tighten it. We suggest that you test the clamp in small increments of about 1/4 a turn at a time. The clamp will need a little muscle to close, but cannot be too loose as it does secure the frame. Adjust the arm enough so that you can close the clamp.
We hope this is helpful.