Review on 📷 CAVIX All-Metal Worm Drive Macro Focus Rail Slider with Close-up Shooting Clamp Plate, 115mm Length, Adjustable with 1/4" Screw & 3/8" Thread for DSLR Camera Tripod Ballhead, Compatible with Arca RRS Lever Clamp W-160 by Michael Jennings

Of course I've only used this once and I'm still not quite sure what I'm doing as there were no instructions included with the product. Because of this, I don't know if lateral judder is normal or mine is defective. In fact, when I turn a knob, something inside nudges the slider sharply left or right, but only a little. If I focus dead center and then turn the knob to one side, my focus moves left or right. Otherwise it's not bad. The handles move freely. The slide is nice and heavy. The numbers are pretty easy to read. Excellent work. Just fix the idiot (and I'm not speaking on my own).