I noticed that one of the main gear air cylinders is sticking during a portion of its travel. I would like to fix it. I disassembled the main gear and removed the air cylinder. Then I unscrewed the square mounting block from one end and the air fitting from the other end. I was able to see into the open end of the cylinder bore on the shaft side and lubricate the piston with BVM air gear oil. But it is still sticking/moving roughly during the last 10mm of travel. Is it possible to remove the cap from the opposite end of the cylinder and remove the piston to inspect the bore and the 'O' ring? I have no idea what the piston is hanging up on but it is not smooth in that area. Maybe I can hand lap it smooth with very fine abrasive if I can find the imperfection.