Battery drain issue

demon322 said
Weird. They look so close other than the missing field space. I’ll order the square back with two spades from the 73 tomorrow.

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Not weird. The one with the grounded field brush is for 69/ earlier, the other is 70/ later, and then "long about" 73 or so, they went to the "squareback" which is an improved design

Plain and simple the parts guy screwed you