Troy Bilt Tiller Tine Bolt part# GW-9669 holds the welded steel tine holder to the tine shaft. This is a 1/2-20 thread bolt that is 4-3/4" long. This part is commonly used on horse and ecno horse tillers. Following are some of the models that use this bolt; 0360, 12055, 12056, 12058, 12059, and 12064. There may be models that use this bolt that we do not have listed, but your owners manual should provide the correct part number for your tiller.