Overcoming the stripped thread for the grease nipple should not be much of an issue. My system is to keep a jar of miscellaneous grease nipples and when one breaks I just replace it. If the mounting thread is stripped, I just tap the hole to suit one of the larger types. From memory the largest standard type is 1/8" BSP (also known as 1/8" Gas). You can probably gather a supply of mixed-thread-size grease nipples from really old equipment lying around or in farm clearing sales. Many old grease nipples are of limited use because the ball the grease gun fits to is worn, and there is excessive leakage when you apply high pressure, but if no great pressure is required this will not be a problem.
