In case it helps, my technique is:
- Wet both the plate/seals and the inside of the grain basket.
- Don't attach the central pipe. Concentrate on getting the bottom plate in first, then attach the overflow pipe
- Slide the bottom plate in vertically (ie, have it in a vertical orientation when you slide it in). This means the friction won't try to remove it from the plate as you do. Slide it in as far as it will go
- Only when the bottom plate is in as far as it can go do you need to start moving it into its horizontal orientation. One side of the plate will be easy to get into position, the other side will slide against the wall of the grain basket and this is where the seal can come off. When doing this, push the seal with the tips of your fingers, not the plate itself. When you push the seal, the plate will move with it. If you push the plate, the seal won't move and the seal will come off the plate. The last bit requires you to push with your fingernails or other thin device to be pushing the edge of the seal that is right up against the inside of the grain basket.
- Once you've got it into position, then attach the overflow pipes
The top plate seems to go in fairly easily after the malt is in.