Threads on the bolt are not a problem because you can replace it easily with a ne one. Stripped threads on the bolt hole are another story. You can try helicoils but the best solution is to redrill the hole and buy a tap which it a threaded tool which you slowly screw in and out of the hole going deeper bit by bit until it has cut a new thread. You will now need a larger diameter bolt. This is aesy if the hole is easily accessible and if there is enough metal around the hole to make it slightly larger. This would be a job that a small engineering works could do and it shouldn't cost a lot. You could probably even wait for it to be done. Threads strip if they are tightened too much, or if you are trying to use a bolt with the wrong thread or if you cross thread the bolt. Also some poorly finished castings have a lot of play in the threads which can cause them to strip easily.
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