Hi guys , i think this may be my first merc post,, i have a mark 28, a mark 28A a pr of merc 200's all with auto trannys i have a manual, it tells me i need a special tool to change impellors, i haven't got to them as i hear they are difficult, this week i got an '55 mark 25 18 hp manual shift, mostly there, first is there any where i can see a pic of this tool , and second can i swap a powerhead from one to the 18 hp