So -- the deck on my Toro Z-Master started going down a little slow. I decided to grease the zerks. 2 of the 3 zerks (one of the two on the rotating shaft) would not take grease so I removed/cleaned them and checked they would allow the grease through while they were out. I reinstalled them but only one of them takes grease. I took out the problem zerk again to be sure it was allowing grease to flow through and it was ok -- but one i reinstalled it, it would not allow grease to flow. I tried to clean out the hole where the zerk went on but it felt rubbery inside and nothing came out as I was cleaning it. It still won't take grease. Any ideas??