Mark @ Everlast
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Replace your cutting edge flat across. No need to heat and bend up the ends. You can weld or bolt the new edge onto the existing edge. Measure the new edge the full width of your bucket and cut off the excess. A torch or cut off wheel will do the job. The upright pieces are for a wear edge when running the bucket along a curb. You can leave those alone. I would weld or bolt the new edge under the original.
Yeah...Uhhh No! Do it right. This is a shade tree hack job. The sides are supposed to fold up. A decent cutting torch head will do all the heating you need to bend the edges up. NEVER cut the side off, as that is a critical point for cutting when you are digging. Cut the old one out and weld it in if it is what I think it is.