My OEM dipstick was sort of loose in the block fitting, suggesting it wasn't even press fitted in. I gooped it in better with some black stuff from a tube a couple of years ago. Maybe your present short dipstick is just 'cemented' in and not pressed in as snuggly as you may fear. I'd hit it with some rust penetrating fluid first, that bolt loosener stuff, Liquid Wrench. Last time I looked, I wasn't leaking oil from my Permatexed in OEM dipstick, so must not be getting much 'oil presuure' at that location.
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