Have you tried heat? Put it in an oven @ 250 for 20 minutes. You can make a puller. Round off the end of 1/16" music wire then bend a small hook in it so you can get behind the rod near the top. Hold the other end with vise grips. The heat will soften the goop so pull while it's still hot. If you make the hook just right you can pry against the counter weight.
MM