Monitor arm slipping on Ultra sled center post during operation

Gear

ZephyrCan I fly my Alexa or RED on a Zephyr?389

Master SeriesIs a used Master Series rig worth buying as a first big rig?191

BFDHow do I power my BFD receiver from my camera or sled?186

VoltCan I retrofit a Volt onto my existing sled or gimbal?168

ArtemisHow do I power my camera and accessories from an Artemis sled?166

MDRWhere can I mount my Preston MDR on my rig?143

ModulusIs there a Modulus option for HD wireless video?141

G-70Will my G-70 fit my vest, gimbal or sled?126

FI+ZCan I control iris and zoom wirelessly, not just focus?60

HU3Where can I get my HU3 repaired, refurbished or repainted?60

CineLiveHow do I pack and case my CineLive rig for transport?54

G-70XHow does the G-70X compare to Pro Titan, Xarm and other arms?46

Trinity 2Is Trinity 2 SUP 3.0 firmware safe to install or buggy?46

Ultra VestWhich vest should I choose for my body size, comfort and operator type?39

2005Center Post forum

21 years old. Gear and prices may have changed since.

The internal catch mechanism that engages with the clamp lever can work loose, causing the clamp to fail to lock properly and instead squeeze into place without clicking.
Tightening the two internal screws that secure the catch mechanism can restore proper clamping function.
Contamination with grease or other slippery substances on the post surface can reduce clamping grip and should be cleaned away.
Light lubrication on the clamp lever pivot pin and the shoulder where the grub screws bite can improve performance.
If the internal adjustment screws reach their limit, adhering a thin shim material approximately 0.002 inches thick to the exterior of the plastic clamping ring can extend the adjustment range back to the middle of its operating zone.
The pivot pin on the clamp lever can seize, leading users to force the lever open and potentially crack the clamping ring.
Over-tightening the internal adjuster screws, which have coarse threads, can crack the ring around the lever pivot point.

The thin shim solution is described as a last resort when internal adjustments are exhausted.
One instance from 2005 is mentioned as being beyond repair.
The discussion involves multiple sled users over time with varying degrees of success, and not all problems were definitively resolved in this thread.
The Ultra design was later superseded by improved designs in the Clipper Two model.