We recently bought a 550J and were going through it in the shop and found three fittings that wouldn’t take grease. Two were on the ripper and we pulled them and cleaned them out and they are good with no galling. The third though is on the blade for the angle adjustment and it won’t take grease. We tried one of those rejuvenaters with the penetrating oil and hammer, heat, etc. The zerk isn’t plugged it is the pin. It is frozen inside of the heim joint. There is not much room to beat it out and we can’t get it to budge. Any ideas?