We frequently replace the pendulum units w/ a traditional 3 sequence reverse unit from the post war diesel locos that have the on / off lever pointing down. We mount the unit in between the motor side frames. You have to drill 2 holes in the motor frame side plate to attach the 'E' unit. It mounts w/ 2 ST #4 screws and a couple of #4 washers to space the unit in a little from the side frame. Repairs are simple to rebuild a unit and wire. Bottom 2 contact wire goes to a brush. center contact of the 4 finger contact goes to the other brush. One of the outside wires goes to the field coil, and the other wire goes to the 'E' unit coil / collector connector on the switch bar connection. Hardest part is finding a used "E" unit. Harry 
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