Swiss Roland

I have recently managed to acquire two Graham Farish Jubilees, which must have been on the retailer's shelf for several years. I have discovered that the tender pickups are (almost) useless. For some reason they are only implemented on the rear tender axle anyway, and as supplied they don't even touch the wheels! I have bent them downwards so that they stand a sporting chance of working, but they still don't make adequate contact - just a tiny pressure with a screwdriver has the motor running away, but as soon as pressure is released the motor stops. I've thought of adding a bit of weight on top, but I don't think this is realistic in the space available. Has anybody solved this problem?

I'm learning how to use the Z21 App on my iPhone. Last night I discovered how to allocate all the sound functions for one locomotive to buttons on the iPhone and I checked this morning that I'd been successful. So now I want to do it for another loco, but I'd like to start by copying them from the first loco and then edit them as necessary. I couldn't find anything on the internet to help me do this. Can anybody tell me whether it's possible and, if so, how to do it? The App contains a lot of pre-defined function icons, but I'd like to be able to add some of my own. For example, I can't find anything sensible to represent braking, so I'd like to import the symbol used to represent the handbrake on car dashboards. Can I do this?