I ran into this with one of the new ratchet bendixes for my 51 merc engine. I did not use it because it would not allow me to install the starter without removing the starter plate from the bell housing. I believe that is what you will have to do. Remove the starter mounting plate, install the starter to it and reinstall the assembly. More trouble than I was willing to go through. I bought a used bendix. installed it and threw a spare bendix spring in my tool box. The new ratchet style bendix is still sitting on my shelf.