The situation My Shimano Nexus Inter-3 internal gear hub is stuck in second gear (it's a 3-gear hub). When I take the external cable housing apart, I can move the pin that goes inside to change gears, but the gear does not actually change anymore. Also, when the pin is fully emerged from the housing, there's still some space left between it and the lever that transfers force from the cable. The pin is still springloaded though, and seems pushed out into its extreme position. Still I suspect that it may not be coming out fully.
Questions What kind of problem could cause these symptoms, and how would I go about fixing it? Is it even possible to open up the internal gear hub to fix this, or would I perhaps be better off not bothering and just installing a new one (which would mean reattaching all spokes)?
I'm not 100% sure, but it seems that this is the hub I'm talking about: Shimano Nexus Inter-3 EV-SG-3C41-2330 -INTER-3 (Edit: broken link removed - this Shimano technical PDF is a close match).