I think Jim has said the motor is toast and therefore the shaft is expendable.
Read Mike's procedural description:
Tyboo wrote:
Taking both set screws all the way out makes sure the point of one is not in a groove or depession on the shaft (actually best to throw one of them in the drink). Tape a block of wood or a stack of silver dollars located so that it will serve as a fulcrum for your big screwdriver precisely 180º ± 1º from the business side of the wiper arm. While gently prying the bugger out with the screwdriver take your unwounded hand and pivot the wiper away from the window while - you ready for this?? - shoving the wiper side of the bugger ON. When the thing pops off you will probably fall in the water, but you'll be so damn happy you won't care. If it doesn't come off, well, what do I know anyway? Probably very little, but sometimes you get lucky!
And then look at this:
Now imagine the tool placed over the top of the wiper arm cap with the "hook" reaching down on the side opposite the arm extension.
Pushing down on the tool would lift one side and press down on the other, just like Mike's directions.
If I remember right (hard at 65), there's a little clip under one side of the piece that fits over the knurled knob on the shaft that holds the arm on. The clip is opposite the arm extension. The little "hook" on the tool pulls the clip back to clear the underside of the knurled knob and frees the arm's body to slide off.
Alternately, if the clip explanation is in error, it may just be that the tool and Mike's procedures provide a straight up lift that is impossible to get by simply prying on one side or the other of the wiper arm base.
Of course, whether it will simply slide off may well depend on how much it's corroded. The shaft may well have to be cut off, anyway!
Don't forget that there are actually several different types of wiper arm attachment mechanisms, and the clip system is just one. Others have exposed nuts on the end of the shaft, or a big tightening machine screw that squeezes down on a collar around the knurled nut or shaft, etc.
This AFI Marine wiper arm has an additional set screw under the arm's base cover to provide additional security.
Here's one you can't just pry off!
Here are some of the special tools available for windshield wiper arm removal.
J.C. Whitney also has some of these (or knock-offs of them) available for cheap.
Under Jim's situation and current mind set, a nasty cut-off tool might be expedicious. Might be good practice for Joan in case she ever has to saw some wise-ass guy out of a Latin American jail in the future (!)
Joe.