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Each of the axleboxes have 2 x 1mm hex bolts holding them to the chassis when you remove the wheels there is another plate which incorporates the motor mounting which is held in place by 2 1.6mm phillips screws, when u remove those screws the entire motor and mounting bracket releases from the frame of the loco, to reassemble you first fit the mounting frame to the motor then lock the triple pulley to the motor output shaft then screw in the 2 1.6mm screw that lock the motor to the mounting frame, you then slide the motor and mounting bracket into the loco frame and screw in the 2 x 1.6mm screws to lock it to the frame, you then bring the set of wheels with the O ring on the axle and bolt them in place, then the each set of wheels has the pulley on the axle mounted in a offset position the axle that aligns with the closest pulley on the motor shaft? to the motor frame has to have the O ring fitted first there is enough room at the end of the motor shaft to allow the O ring to fit and the last O ring which drives the fan goes onto the motor shaft last. So replacing any of the O rings is fairly easy the O rings are Nitrile NBR? rubber so they will last a long time and won't perish.

I am planning to release this as a photo etched kit etched in nickel silver, the kit will complete with everything you need parts wise to build the complete loco, you obviously need to soldering skills to build the kit. it can be set for either 14mm gauge or 16.5mm gauge