monitor arm keeps tilting down

Mount-It! Free Standing Dual Monitor Stand | Double Arm Desk Mount Fits Two 21 24 27 Inch Computer Screens | 2 Heavy Duty Full Motion Adjustable Arms

Peerless SmartMount Universal Flat Wall Mount for 10" to 24" - Black

Mount-It! Full Motion Dual Monitor Mount with Spring Arms, 17 in. to 32 in. with Tilt, Rotation, Swivel, Height Adjustment, Clamp or Grommet, Black

Kantek Wide Deluxe Two-Level Monitor Stand with Drawer, 20" x 13.25" x 3" to 6.5", Black, Supports 50 lbs

Mount-It! Height Adjustable Full Motion Wall Mount Workstation with Single Monitor Mount, Keyboard Tray and CPU Holder Fits 32 Inch Computer Screens

Mount-It! Laptop and Monitor Desk Mount | Fully Adjustable Laptop Mount | VESA Monitor Arm Stand | Desk Pole Mount Extension for Monitors and Laptops

Planar Adjustable Dual 24"-30" Monitor Stand Black 997650402

Monoprice Sit-Stand Articulating Monitor and Keyboard Workstation | Made of High-Grade Aluminum and Steel

Workstream by Monoprice Low Profile Dual Monitor Gas Spring Desk Mount

Mount-It! Full-Motion Triple Monitor Desk Mount, Holds up to 14.8 Lbs. - Silver

Mount-It! Sit Stand Workstation for Single Monitor and Keyboard | Height Adjustable Standing Desk Mount with Monitor Mount and Keyboard Tray

StarTech Dual Monitor Mount with Full-Motion Arms - Stackable

Targus 4Vu™ Privacy Screen for 11.6 ” Widescreen

Mount-It! Sit Stand Wall Mount Workstation | Adjustable Height Stand Up Computer Station with Articulating Monitor Mount, Keyboard Tray, & CPU Holder

SIIG Triple Monitor Desk Stand for 13" to 27" Displays

Mount-It! Dual Monitor Mount | Double Monitor Desk Stand Arm | Two Articulating Arms Fit Two Screens 17 - 27 Inch Computer | C-Clamp Base

Targus 4Vu™ Privacy Screen for 27" Apple Thunderbolt Display, 16:10

Mount-It! Mobile Standing Desk with Dual Monitor Mount | 40 Inch Wide Height Adjustable Rolling Computer Workstation with Four Wheels | Black

Mount-It! Dual Monitor Mount and USB Laptop Tray with Cooling Fan Fits 13 Inch - 27 Inch LCD Screens, Silver

Mount-It! Dual Monitor Arm Mount Desk Stand Two Articulating Gas Spring Height Adjustable Arms | Fits Up To 32" | C-Clamp and Grommet Bases | Black