monitor arm keeps tilting down

Ergotron 45-295-026 LX Desk Mount Mounting Arm for Flat Panel Display

Mount-It! Electric Ceiling TV Mount with Remote and App Controller | Motorized Flip Down Pitched Roof Mount Fits 32 to 70 Inch Flat Screen TVs | Black

Ergotron MX Desk Mount Monitor Arm For Up to 30" Display, Aluminum

Ergotron Mounting Arm for Flat Panel Display All-in-One Computer 45383026

Ergotron MXV Wall Monitor Arm Matte Black 45-505-224

Ergotron LX Arm, Extension and Collar Kit (matte black) 98-130-224

Ergotron Mounting Arm for LCD Monitor Matte Black 45496224

Mount-It! Weatherproof TV Wall Mount | Lockable & Tilting 2.1" Low Profile Design Fits 37 - 80 in. Televisions | 176 Pound Capacity

Ergotron MXV Desk Mounting Arm for LCD Monitor - 34" Screen Support - White

Amer Mounts AMR2AWS Wall Mount for Monitor Keyboard Mouse

Ergotron WorkFit Conversion Kit: Dual or LCD & Laptop to Single HD

Ergotron Mounting Arm for Flat Panel Display 45241026

Ergotron 45-361-026 Mounting Arm for Flat Panel Display, Notebook

Mount-It! Monitor Riser with Drawer | Height Adjustable Monitor Stand with Sliding Three-Row Storage | Riser for Computer Screen, Printer, or Laptop

Mount-It! Advanced Tilt TV Wall Mount, Full Tilting Extendable Mounting Bracket Fits 37" - 80" Screen, Perfect Above Fireplace Mounting Bracket

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

Ergotron StyleView Lift for Flat Panel Display Black

Mount-It! VESA Mount Adapter Kit | TV Wall Mount Bracket Adapter Converts | Fits Most 23 Inch to 42 Inch TVs and Monitors | Hardware Included | Black

Monoprice Essential Dual Monitor Articulating Arm Desk Mount | 180° Swivel, 360° Rotation

Motorized Ceiling TV Mount Silent Electric Flip Down TV Mount for 50-90 Screens, Retractable Drop Down Design, White

Mount-It! Long Arm TV Mount, Full Motion Wall Bracket with 40 Inch Extension Articulating Arm, Fits Screen Sizes 42 to 80 Inch, Holds up to 110 Lbs.

Ergotron 200 Telescoping Combo Arm - 18 lb - White

Clamp-On Heavy Duty 4 Monitor Mount - Silver

Samsung Wall Mount for Flat Panel Display