Have read of a few people having issues of foreign material being in fuel tank. When looking at tractor, repairman mention of someone having a half a peach in the tank. So, never knowing who or what might get in the fuel tank, is there such a item as a locking fuel cap that would fit a bx2370-1, or is the cap a universal gas cap that is 3.5" size. Also, after tilling ground noticed that zerk on side of tiller had dirt on it. Wondering if all zerks use same size of cap covers on them. Thinking of yellow or black to offset finding on points to grease.