"rw" said:

Another method involves a partner. Each person puts their hands on the
part of the rod opposite them and pushes the sections apart.

RW's technique has worked for me for 50 years on all types of rod's ferrules
or rods and handles. My Dad called it the "push and pull" technique. Each
partner holds the rod with both hands. The left hand holds the rod away from
the ferrule and the right hand holds the rod next to your body. Each
partner then pushes with the left hand and pulls with the right hand to make
the rod separate. This works with a strong man and a child or two weak men.
It works especially well when your rods have bounced up and down in the
vertical boat racks guides use which make the fittings very tight no matter
what lubricant was used.

Good luck!
John