I need to replace the prop drive washer on my DA-100. I received a new one from DA, but can not get the old one off. I am using a gear puller and made a washer adapter to hook the puller to. I have appled considerable amount of pressure, but it will not budge. I have tried tapping of the pulley head to jar it loose, applied heat to the drive washer to expand itall to no avail. Will not budge. The new unit is tapered with a key for alignment. Other than the key, I see no reason as to why it will not break loose. Anything I have missed, or any suggestions would be greatly appreciated.[&o]