I am owning a Hunter 310 build in 1997 with a yanmar engine. The propellor shaft is 25 mm. Can anybody tell me what the dimensions of the conical part of this shaft are ? I.E 25mm x diameter2 x lenght of conical part. Also does anybody know the size of the key that is installed ? I need these measurements in while I want to order a folding propellor and want to take the ship out of the water only once.