You can use a tread sealer which will work well. You can try Loctite 572. Around R350 for a tube, but well worth the money. Hope it sorts your problem.
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For what its worth - also have a look at the Oberon clutch slave cylinder. Apart from looking 10 times better than the OEM one, it comes with a lifetime warranty. Very few manufacturers have that much confidence in their products! May just be the difference between you next "limp home trip" and...
Offering an once in a lifetime good home for a Honda XR650R. Bike must be in original condition without marks or damages. Must be a 2003 model or later with low mileage (below 8,000km). Need to get some company for my current XR600R. If you know of anyone that would be prepared to part with...