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Hello, I was wondering if anyone knows of any mods that can be carried out on the above machine. Even how to tune it for optimum performance. I'm doing electronic engineering at the moment but am just starting to get to the practical stuff; it'll make a change build/fix something and know what happened. How do you build a meter for one; do they really help ? Is a 10'' stock coil the best match. Does anyone have the schematics etc for a gpx model as I'll build one before I'll buy one. Thanks