Pro-Cut's new Disc-Lock Trolley adds a number of features to their previous model, offering improved anti-rotation characteristics and usability. Upgrades include an L-arm and upper trolley arm with drilled disc, caliper and pads actuated by a lever. Improvements have been made in the vertical height adjustment power screw design. A steel roller in the forward section of the vertical outer tube helps to bear the increased weight of brake lathes smoothly.