Stuck distributor rotor

[USCGunner]

I went to change the rotor and cap on my 91 LX 5.0 not sure how long they have been on the car. The rotor is stuck on the shaft and does not seem to want move, any suggestions on getting it off?

 

[General karthief]

They are plastic, how they can become immovable is beyond me but they do, drill a few holes in the top and spray a little blaster in there then take a pair of channel lock pliers and work it off. Take a vacuum and suck any junk from the inside.

 

[USCGunner]

Thanks