I have examined the bolt which had come out of the "stripped" hole. It had ahelical coil wound on the threads so it appears that the hole had been repaired before. I attach picture of the coil. It may have been that locktight was used on re-assembly and this caused the coil to stick to the bolt and so the whole lot screwed out when I was removing the bolt.I may try a new coil otherwise 3/8" BSF tap and bolt.
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