monitor arm keeps tilting down

Premium Height Adjustable Double Monitor Arm Black - Rocelco: Ergonomic Dual Screen Stand, 13"-27" Compatibility, VESA 100x100

Planar Dual Monitor Desk Clamp - Supports Up to 27"

Dual Monitor Stand, Adjustable Monitor Desktop Mount, for 13 to 32 Inch Computer Screens - Each Arm Holds 4.4 to 19.8lbs

Premier Mounts Low-Profile Dual Stud Dual Arm Swing AM95

Mount-It! Premium Monitor Desk Mount Arm for Single Computer Screen | Heavy Duty Clamp and Grommet Base | VESA 75x75 and 100x100 (mm) Fits 24 - 32 in.

Amer HYDRA2 Dual Monitor Mount with Articulating Arms - 15" to 28" Monitors

Mount-It! Space Saving Dual Monitor Arm, Fits Two 17" to 32" Screens, Full Motion Tilt Swivel Rotate, Low Profile Front Arms for Cubicles and Desk

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

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

Mount-It! Single Monitor Desk Mount With Gas Spring Arm | Clamp Base | Modular Design For Future Expansion | Premium Aluminum Cast

StarTech Dual Monitor Mount w/ Built-In 2-Port USB and Audio Pass-Through

SIIG Dual 17-35" Monitor Heavy-Duty Premium Aluminum Desk Mount CEMT3011S1

Amer AMR2AW Dual Articulating Display Wall Mount

Mount-It! Full Motion Universal Design Laptop and Tablet Desk Mount Stand Fits 17" Laptops and 11" Tablets | Silver

Fellowes Platinum Series Single Monitor Arm, For 27" Monitors, 360 deg Rotation, 45 deg Tilt, 180 deg Pan, White, Supports 20 lb

StarTech Monitor Mount with Articulating Arm and Slim-Profile Design

Mount-It! Car Laptop Mount for Commercial and Personal Use Vehicles, Heavy-Duty No Drill Notebook Vehicle Stand for Trucks, Vans and SUVs

Mount-It! Single Height-Adjustable, Articulating, Pivoting, Swiveling, Tilting, Arm Desk Mount for LCD, LED, Computer Monitor Displays, Silver

HUANUO 27-57 In Monitor Mount, Gas Spring Arm Desk Stand with Clamp Grommet Base for Computer Screens

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

SIIG MTPRO Heavy Duty Desk Mount Single Monitor Arm - Up to 49?, 4.4 - 44 lbs

Tripp Lite Dual-Display 13-34" Monitor Flex-Arm Clamp/Grommet Mount DDR1732DAL

Mount-It! Heavy Duty Monitor Desk Mount w/ USB & Multimedia Ports