monitor arm keeps tilting down

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

Mount-It! Dual Monitor Arm Mount Desk Stand | Articulating Mechanical Spring Height Adjustable | Fits Two 17 - 32 Inch Screens | C-Clamp and Grommet

LG WM-L000S Wall Mount for Interactive Whiteboard

Alogic Clarity Fold Stand ACFS

Amer Mounts Long Articulating Monitor Arm with Clamp Base for 15"-26" Displays

Amer Mounts Dual Monitor Vertical Stand Mount - Max. 32" Monitors

StarTech Single Swivel Wall-Mount Monitor Arm for 13" to 34" Monitors

Mount-It! Single Articulating, Full Motion, Tilting, Wall Mount For 13 - 32 Inches, Samsung, Sony, Asus, Dell, LG, Sharp, Insignia, ViewSonic - Black

Atdec Freestanding Heavy Duty Dual Vertical Monitor Mount AWMS2BT75FSB

Atdec Heavy Duty Dual Vertical 24-55" Monitor Desk Mount Black AWMS2BT75HB

Mount-It! Full Motion Premium Single Monitor Wall Mount Arm | Quick-Release Modular Mounting Bracket for up to 34" Monitors, Silver

Mount-It! Height Adjustable 4 Monitor Stand Arms | Quad Monitor Desk Mount | Fits Four Computer Screens 19 - 32 in. | C-Clamp and Grommet Bases

StarTech Single-Monitor Wall Mount Arm w/ Height Adjustment - 30" Monitors

Mount-It! Articulating Computer/TV Monitor Wall Mount for Screens 30 Inches or less, Built-in Quick Release Action for VESA 75x75 & 100x100

Fellowes® Office Suites™ Premium Monitor Riser

Mount-It! Full Motion Height Adjustable Single Monitor Wall Mount | Tilt, Rotate, Swivel Arm Wall Mount Stand | Fits Up to 32 in. Screens

SIIG Premium Aluminum Freestanding Triple Monitor Desk Stand CE-MT2111-S1

Amer Mounts AMR1UW Mounting Arm for Curved/Flat Screen Display

Amer Networks AMR1AWSV1 Wall Mount for Keyboard CPU Mouse Flat Panel Display

Monoprice 2-Segment Wall Mount For Monitors Up To 27 Inch | Adjustable Gas Spring - Workstream Collection

Mount-It! Full Motion Triple Pyramid Monitor Desk Mount, Height Adjustable Three Monitor Desk Mount Spring Arm Quick Release / Mount

j5create Ergonomic Dual Monitor Mount, JTSA102

Amer AMR6S32 6-Panel Monitor Stand - 26" to 32" Monitors