I recently took apart my go-devil shaft, for the first time, that I had bought last year. I noticed that the bottom seal (bushing?) was broken and water was slowing getting in along with weeds sucking in. My grease was watery and such. Would it be alright to change out the bushing for sealed bearings? The OD and ID is a perfect for the shaft and the frame. Would this work? any other suggestions? Can I put sealed bearings on both the top and the bottom of the frame?