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The tensioner on the 81 has three springs lined up in a row the center one is called a guide spring they are round springs about 3/8 OD the kind you would find at the hardware store or industrial supply co.
To remove you would need to take the nut and large washer off the end of the tensioner you will see two holes in the end of the pot metal barrell use two tapered 1/8 round stock and slide in each hole to release the paws from the center shaft, you can now remove the tensioner from the center shaft then slide the bronze sleeve off and the springs will come out. Note each paw will have a coil spring behind it be carefull not to let them fly out and get lost they are much smaller than the tension springs.
Hope this helps