My irritrol 205 valve is leaking. I know I need to change the diaphragm but was warned by the salesperson that this can be tricky. He was right, I changed it and now it leaks more than it did before. Has anyone repaired one of these and do you have any suggestions on how to get it right? I think I'm going to have to buy another new diaphragm. It would make sense to just replace the valve however, I would rather not have to go to the time and trouble. Any suggestions would be much appreciated.