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Thanks for your reply. The Oberon slave came with a loose spacer, and I've checked with a magnet that there isn't one in the piston already. A loose spacer sounds like a good idea though, from the anti-spin point of view.
No, there is no pin in my pushrod, but I'll measure the length today.
The reason that Ducati slaves and early aftermarket ones failed with black fluid reflux is simply that they used NBR seals which break down in contact with hot hydraulic fluid. Viton seals do not and when makers realised this, the problem stopped. It wasn't down to pistons spinning or chain gunk getting in, just chemical incompatability of the seals.
The Quiet Clutch Mod you link to is my own writeup, borrowed by Ducati-upnorth from the ST2_owners web-site for which I penned it. It works perfectly, maintains new clutches and preserves worn ones almost indefinitely. Many thousands of quieter miles have been had by me and other ST owners, and probably by other Ducati owners who don't relish the sound of something destroying itself unnecessarily!
Cheers,
Nick (not a Ducati newbie, just new to the S4R!)
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