They're all like that, from the mid 1980's all the way to 2011. Some of the ***** have brittle glue, and will just come right off. Others, put up a pretty big fight. If you're not intending on keeping the ****, take a big pair of channel locks and grip down it while twisting it back and forth. This usually does the trick, but if it still isn't helping, you can try heating the **** up with a heat gun to "soften" the glue.

 

 

 

 

Mine was just splined on there, yours is probably the same, it should just pull off.
Take the smallest open ended wrench you have that will fit underneath the **** and tap on it with a hammer _ lightly.

 

No threads, just splines

You need to heat up the **** using a heat gun or even a hair drier, then use an open end wrench or pliers UNDER the base of **** and then use a hammer to TAP on the wrench to push it up and off


Heat it up again to put it back on