The leaks I have are due to the back of the pad coming down before the front of the pad. It is my understanding that this is OK if it closes completely with hardly any pressure, but if it takes too long to completely close it can cause some problems and my D1 does cause a problem. So I fixed the D1 using a tool I made myself out of an cheap butter knife. What I did was slide the blade under the back of the pad while carefully using pressure to bend the the front of the key down. I did this several times while using a leak light to check my progress. When it looked OK, I checked the back of the pad to make sure I hadn't gone too far. I was recently told by an expert that the way you are really supposed to do this is to heat up the cup and then adjust the pad to make it fall evenly. Which is the preferred method?