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Better late then never... Hi Charles, There are a couple of companies that do Arm and Spring maintenance/upgrades/modifications... Robert Luna of course but also: - Daniel Sauve - Howard Smith (MK-V) - Hugo Langer and his Silver Spring conversion (Rig Engineering) - Tiffen (They still have springs in stock for the 3A/EFP Arm, last time I checked) Spring Color: Median Load: (+/- 2.5lbs) Red 37 Green 40 Blue 45 Black 51 Gold 54 EFP 24 to 39 lbs 3A lightweight 29 to 47 lbs 3A standard 37 to 57 lbs Master Broadcast 40 to 57 lbs Master Film/Elite 42 to 67 lbs I'm also including the Master Arms as in the past people have substituted 3A springs with Master Springs to reach higher load capability. I hope that helps. Erwin Landau, SOC www.landaucamera.com