cfz2882
Well-known member
it is a cinderblock with 2 notches so it can bolt to the motor/transmission frame opposite the motor to counterbalance the motor-i think the cinderblock started about 1968,before that the weight was a black cylinder that may have been filled with concrete.I have saved these cinderblocks from every filterflo i have junked-use them as paverstones for backyard paths.The pulleys and cable suspension goes well back into the '50s 
