What are the eight evils spike
6. off: nail rod and rail bottom is not affixed with a gap of more than 2 millimeters.7. grinding: the upper part of the nail rod and the rail bottom contact parts wear more than 2 millimeters of clearance.8. bends: nail bars are bent at any place and are not visually straight.
3.: back along the rail direction visually, spike cap is tilted backwards.4.: the vertical crooked rail direction visual spike, the nail rod is tilted to the left direction.5. oblique: the nail bar has only one edge and the rail bottom edge is attached.
1.: the floating bottom and the bottom rail is not close, there is a gap of 2 mm or more.2. answered: along the rail direction of visual, spike cap front tilted forward.
