Just have had the same problem, in an old Tecnolimits boom. A friend, former surfshop retailer, told me that usually the problem comes from the boom clamp side, so I've unscrewed the arm from the clamp and then made an hole in the inside plug, let the water go out and the arm dry for some days and then covered the hole with some sylicone.
Note that the plug oth the lamp side is near the arm end and so easy to reach, on the extension side is far and difficult to find. Imho obvioulsy
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