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Kinda rare to break these, an SKS mantel plate will fit (60mm wide I think), just drill out the old rivets and rivet new one in.
As for your gear shift, if you set it on the line and then it misbehaves in both direction = cable issue, or the actuator on outside of hub is full of crud or not fitted properly.
Must have a kink or some damage somewhere. If you remove old cable, measure the end of the outer to the metal nut with a caliper, tighten caliper and leave it set aside for when you thread it back together, think its something like 86.5mm but its hub dependent (shimano tech docs will tell you)
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I've just stuck it together with Sugru. Can't be fucked drilling out rivets on a mudguard.
As for the gearing, yes there is a kink in the cable now. I can't straighten it because of where Besbike have put the housing between the motor and the underside of the frame. It's not possible to even move the housing a mm or 2. See the above pic.
It's only very slightly misaligned now with the two yellow lines. I will just have to suck it up. Not bringing it back to Besbike to have the motor taken off. I emailed Alex earlier today asking him if he was around, no response. From the time delay and the times I've received a response from him I'm guessing he's abroad.
Arrgh.. just noticed one of my mudguard arm clips is snapped. It was definitely fine before I brought it to Besbike.