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Sir, I fully appreciate your detailed explanation about the parts and working of Tullu half hp pump. I would like to advice you on the following:- 1. When the shaft, bearings , water seal , impeller and bolts are very rusty generally kerosene or WD 40 or little acid is applied so that u get smooth opening which has not been done by you while opening the parts of the pump. 2. Before fitting the bearings or impeller, key or water seal you should apply grease generously. You have not done this in your demonstration video. Please take care of this in the next video.