What Springs are used in Plarail Engines

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I don't recall anyone ever finding a source for the gearbox springs. Depending on which motor type there can be two different springs in there. Like D-Real mentions above, many collectors have accumulated extra parts over the years with old, damaged or not working trains especially those pesky springs which can easily be lost when opening a gearbox if one is not careful. You may want to check for broken or not working sales on ebay for the motor type you are looking for. Then you can start your own extra parts box with gears and springs.