Seized dipstick

Anyone got any suggestions on how to remove a seized dipstick? It hasn't broken inside so still have the handle but it won't budge, I've just got back from a long drive to get some heat in the engine bay but that hasn't worked, I've tried putting a screw driver in the hoop but that didn't work either, I've also sprayed it with wd40 to see if that'll work but I can't get it around the actual bit I need to
 
crazy! I assume that the rubber has swollen due to heat or there is some gunk inside. Just pull but straight up not at an angle....my .02 ....
 
Tried that lol.... Looks like im going to have to pull the sleeve off as well.... I would try the compressor trick but I live in a built up area
 
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