I looked inside my washing machine and noted that the agitator was
moving slightly but not at the normal speed. I checked and the lower
part of the agitator is working fine, but the top part is only slight
moving.

The machine is 12 yrs. old and everything else is perking right along
except for that darn agitator! Is this something that I can try and
fix myself or would it require special tools and heavy lifting?

This is a Whirlpool washing machine and the only identifying numbers I
see under the lid are Stylemaster 4213632 Rev. B

I appreciate any help and assistance.