This part fits your Tiller
Hex lock nut 3/8-16
Genuine OEM Part - Manufacturer #712-0130
This part fits your Tiller
Jam lock nut, 3/8 - 16
Genuine OEM Part - Manufacturer #712-0266A
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This part fits your Tiller
Nut
Genuine OEM Part - Manufacturer #712-0392
This part fits your Tiller
Nut-hex patch lock
Genuine OEM Part - Manufacturer #712-3067