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These holes usually go bad from not keeping the bolts tight over a long period of time. If they are just worn and not really stripped, new bolts will often fix the problem. A belly mower is not as bad a load as other implements so new bolts may fix the problem. Often the old bolts and old threads don't mate well and the threads look really bad but new bolts will take a nice bite. The tapered-shank bolts are a little hard to find. But you need them to fit the implements right. These holes would be a pretty large size for heli-coil but that should work unless the casting is cracked. Also, the castings are reversible. You can take the left off and put it on the right. So if you want to go to a lot of work, reverse the castings as the three holes in the front are very likely to be like new. If the castings are cracked a good machine shop can drill them out and weld in a new threaded steel bushing.
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