brightspark
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- yarm stockton on tees
its a brooks reversing drumIf that reversing switch is a "Square D" (Schneider). Have a look here
http://products.schneider-electric.us/products-services/products/contactors-and-starters/manual-starters-protectors-and-switches/type-a-and-b-reversing-drum-switches/
I've got one on my pillar drill and I reckon I've sussed the wiring out for it.