Regarding my order from Hobby Lobby
I can now vouch for their authenticity despite having zero communication from them.
I paid on December 21st by bank transfer and given the Xmas period I’m happy that it arrived today by DHL
My only concern is that the pipe may be a little too short but I will overcome that.
EDIT after full inspection I find that the specified measurements are incorrect.
The overall diameter is 38mm and the propellers are just barely 30mm but can not be confused with the 32mm version.
I have just ordered a 38mm I.D. clear acrylic pipe 44mm O.D. this will allow me to fit this as a sliding fit and thus be removable if replacement is required. The pipe wall thickness will allow some flaring at the hull skin