I wanted to mention that the Suntour Cyclone cable pinch bolt is smaller than a dia-compe or weinmann pinch bolt. I think that Cyclone uses an M4 dome nut/bolt, whereas the Dia-Compe and Weinmann are M5. As far as I am aware there are no other bike components using this M4 dome nut/bolt.
I have one cyclone derailleur that I purchased on ebay where someone had drilled out the cyclone hole, in order to install an M5 nut/bolt. If someone does this they need to file one side of the the pinch bolt slightly, so that it seats properly on the derailleur body. I would not recommend trying this as a first step because it will weaken the derailleur body and the derailleur might eventually fail there.
It is far better to find a dead derailleur with a broken body at an LBS and steal this nut/bolt combination. Another possibility, if it's just the bolt that was stripped, is to get an M4 bolt (stainless!) and attempt to drill a hole through it with a dremel.
- Don Gillies
San Diego, CA