I had the same problem today. Store told me part 71 85740991 would work.
It does not have same shaft to attach. The original has a plastic head which
melts with use and will not work. I feel it is a defective device. They have a replacement part that does work for a while and does the same thing. Sears
should provide a proper head. A higher priced machine has a proper head.
I would like to by the better shaft and head which I think would fit this machine
but am told you can'[t buy. I'm very discouraged with them. Then engine runs fine.
If you find a solution I would like to hear from you. Thank you.
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