I’m adding the mulcher to the blog because I have a feeling this is going to be an ongoing saga. I bought the chipper mulcher (COX model 7204h)for $150 second hand. One of the three rotor arms was bent over, that’s the bent peice of flat bar at the bottom of the photo. The air chisel and a hammer freed the bent rotor arm from the welds that weren’t already fractured. Six millimeter plate was never going to hammer back into place nicely while the rotor was still attached to the engine. The seller’s optimism that a good hit was all that was needed was probably to hide that the rotor is well and truly seized onto the engine shaft. Oh well. Also well that ends well. All the old welds were ground back and with the new bar everything welded back into position.