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791-181468B Bump Head Knob Assembly Replacement for Troy-Bilt TB575SS (Big Red)(41ADT57C966) Gas Trimmer - Compatible with 181468 Bump Knob and Spring Assembly - Walmart.com
Troy-Bilt 29cc 4-Cycle 17-in Straight Shaft Gas String Trimmer and Edger in the Gas String Trimmers department at Lowes.com
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2 Troy-bilt weed eater valve adjustment - YouTube
Carburetor for Troy-Bilt TB575SS TB590BC TB146EC Walbro WYL-19-1 WYL-19 WYL-229 WYL-229-1 Mower Replacement Parts - AliExpress