Dr Field Brush review: mower

Critical bolts on rear end came loose and did 500 dollars of damage mower has 30 hours of use but is out of warranty most of its warranty used up sitting in shed. Mower is expensive to buy and I feel company should replace parts for free due to these bolts should never of come loose any critical bolt should have a metal tab that can be bent over to stop this or lock tighted I can't believe that I am the only one with this problem and am really missed off at Dr field and brush mower company