Hello, Does anyone have the bottom drive gear to suit an N or P type DDS dynamo? It should have a double bevel where the teeth are as per the photo, the centre hole should be 5/8" with a key. I have a J type one and it won't mesh with the crank gear as it's not as deep as the N/P type one. Just been told that I need a P Type one, the P Type gear has a 5/8 hole for the dynamo shaft and an N type is 3/4. My DDS has a 5/8 shaft.