What the thread found

• Springs in Master Series arms can break unexpectedly even when the arm is not overloaded and working within specifications.
• Spring failures may occur more frequently in older arms that have not been rebuilt in several years.
• A pinging noise from the springs can indicate an imminent failure.
• Annual inspection and overhaul of Master Series arms costs approximately $1500 USD and helps prevent catastrophic failures that can damage other arm components and cost $5000 or more to repair.
• Spring failures in heavily used arms (5-8 hours daily) can occur multiple times over several years of operation.
• When a spring breaks, all springs should typically be replaced rather than just the broken one, as remaining springs may be in similar condition.
• Alternative arm designs such as the PRO arm have demonstrated significantly better spring longevity with users reporting zero spring failures over 12+ years with minimal maintenance costs.
• The G70X and PRO arm designs address previous issues with stiction that affected earlier generation master arms.
• A PRO arm with 4 canisters can handle loads from 13 to 63 pounds and provides a more cost-effective long-term solution than maintaining multiple Master Series arms.

Depends on

• The frequency of spring failures may vary depending on actual usage patterns and environmental conditions.
• Exact repair costs quoted by manufacturers may vary by location and year.
• The comparison between different arm types reflects one user's experience over eight years and may not apply universally.
• Whether annual maintenance prevents failures or is merely recommended practice remains anecdotal rather than definitively proven.
• Some participants expressed disagreement about whether the PRO arm's load range is directly comparable to the G70X system.

Gear in this thread

Master Seriescatalog, G-70Xcatalog

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