Some shaft seal housings are available ready made, but 5mm may prove tricky.
You can simply use a simmerring, which is Freudenberg's trade name for a small oil seal. They're just a press fit into a suitably sized hole. e.g. https://www.aliexpress.com/item/1005...Cquery_from%3A
You can simply use a simmerring, which is Freudenberg's trade name for a small oil seal. They're just a press fit into a suitably sized hole. e.g. https://www.aliexpress.com/item/1005...Cquery_from%3A
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