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Disk blades are special hard metal under a lot of stress in the field. Never knew a weld job that would last, but I don't know everything! :) The outer blade or 2 are pretty easy to change on the front gang most of the time. You need to take the big nut off and pull off parts until you get to the broken one. If the disk has not been taken apart in a while, that nut can really be frozen on big time. Big pipewrench & sometimes a torch. Be _sure_ to get it on tight again, and spend a whole day retightening the gang when you use it again. It probably has some sort of nut locking device, it needs this. If it is at all loose, it will wobble blades & hurt the shaft. Retighten several times while using the first day. I'll bet your blades started out as 18" and wore down to where they are. It will be hard to find the right size, and you do _not_ want a bigger one on the outside for sure! You may want to search around for some 'wore out' 18 or 20" blades someone took off, which will match your size blades. Blades break from hitting rocks mostly. Also, is your disk a solid frame wheel lift? Then they break from making turns with the disk lowered, the disk should be raised on corners. --->Paul
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