first you need to clean the hole out with brake cleaner to remove any oil,secondly an old timer tought me to always put a dab of grease on the back of the seal where the garter spring is to keep it from falling off during installation. i almost never install a seal dry whether its a car,truck,lawn mower etc. i use permatex hi tack spray on the outside of the seal before installing,helps seal it and hold it in place. hope this helps
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