Removal of incorrect wiper arms from '64

[Edward Trenn <imperial64@xxxxxxx>]

Folks,
I have an incorrect set of wiper arms on my '64; they are supposed to 
screw in with a chrome bolt, but instead are similar to '66 and later 
which have a solid piece with NO bolt. How do I remove the arm? The '66 
service manual shows a special tool that looks a bit like a wrench. Is 
that tool still available?

I'm assuming that they were stuck onto the original posts, but any any 
advice is appreciated.

Thanks!

Ed Trenn
'64 Crown Coupe
'64 Crown convertible