Hello Egon, Is the forward end of the tube fixed in the hole in the frame or is this more or less a loose end? The motormount looks not very stable and will allow vibrations. The hole in the tube you use for oiling/greasing the shaft? In this situation the oil will flow astern and hold back by the water. In fact you have to solder a piece of pipe on the hole to get some "oilpressure" on the tube keeping the water out and get some oil to the front bearing. It's better to mount the motor on a frame, glued to bottom and sides. And use all mountingholes in the motorframe. It's quite a long end between mountingplate and coupling and this will allow wiggling. It's a bit difficult to explain in English, but hope you will understand. If not send me a personal message or a mail. Success. Rgds, Klaas.