Hetman - Ball Joint Oil (Hetman #15) for mechanical linkage joints.
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I own a 35 year old Yamaha 868 and am currently a music student studying performance. The thumb valve on my particular model of horn is operated by a ball joint, which is fairly worn due to it's age. It's been getting a little loud lately, but this oil solved that and also seems to have good staying power.
Shipped quickly and exactly what I ordered