The "drive saver" is the red puck
Your going to remove the 4 bolts securing the shaft coupling to the drive saver, this should allow you to pull the shaft and coupler back.
Then place a nut or small socket, smaller than the dimension of the shaft, in line with the shaft in the coupler.
Now you need to get some longer bolts, maybe 1/4 to 1/2 inch longer than the originals, and thread them back into the drive saver end, then being sure the 4 shaft coupler pinch bolts that clamp the coupler to the shaft and any set screws are removed.
You'll tighten the longer bolts until the socket is touching the shaft and the saver internally you'll see a gap there now.
If you now tighten those longer bolts using a crossing pattern, top, bottom, L side, R side, tightening pattern you'll see that your levering out the shaft, using the socket and screws, you may need to tap on the coupler to help getting it started to moving out of the coupler bore.
You may have to Change the length of the socket and bolts to continue until the coupler is freed.
Spray it down in the shaft to coupler seam with some PB Or WD 40.
If it's not moving with this method, be sure you've lined up everything well.
You may need to block the coupler so it cannot spin on you.
FYI -- you'll need to tap the shaft back on to the coupler , via a diver underwater, or very gradually with a brass hammer on the coupler, don't bang on the outer edges of the flange.
You may need a diver for the back on maneuver.
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