I had the same problem with removing the brake puck on my 1650 with the same leak. I used a rotary drill wire brush that would fit into the brake puck hole in the transmission housing to get most of the scale out, then manually used steel wool to try to get down closer to the puck edge, along with plenty of WD40 as a flushing agent.
To get the puck to pull out was a challenge, like mentioned above, but I had a pair of external flat blade snap ring pliers that I could fit into the bore where the plunger from the linkage fit. With a little patience (which I generally don't have a lot of), more WD40, and working the puck back and forth with the pliers, it finally came out.
I was also concerned prior to the repair, due to the age of the tractor, that I might find the friction material button to be worn down, so I ordered one of those as well. After getting the puck out and replacing the friction button, I could have saved the cost. It really wasn't that worn.
I will also warn folks who may be doing this for the first time, there is a loose ball bearing in the center of the puck bore where the plunger fits. Keep an eye out for it as it can easily fall out when removing the puck.
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