I have owned the above motor for a few months and have used it for about 15 hours or so. Its had a few problems within that time - but currently running nicely!! I'm just wondering how easy it is to replace the impeller on this motor. Do I need to purchase a service manual or should it be fairly straightforward? From the diagrams I've seen online it looks like the bottom half of the motor should be fairly easy to remove allowing me access to replace the impeller. Any advice would be gratefully received...