My go to KTM dealer was supposed to include a spare clutch slave cylinder O ring in my last order; about 3 weeks ago. I suspect he doesn't have one. But, after my buddy had 2 failures on his spanking brand new Husky 701, I decided I better move away from the stock Magura the next time it needs a rebuild. I was looking at either Oberon or the Rekluse Manual Slave Cylinder. I like what I see with he Rekluse and it comes with a rebuild kit: https://blog.rekluse.com/the-rekluse-manual-slave-cylinder-advantage The design of the Rekluse looks a lot more robust. Rekluse uses 2 sealing O rings and a unique spring. Maybe someone like Rekluse can solve the other problem with our 690....that being the countershaft leak. Should be a lesson for Magura. FYI. If you ask your KTM dealer, they should be able look at inventory across all dealers and tell you where you can order a KTM part you're looking for.