I posted a similar question a little while ago, but not this specific.....

I need to replace/rebuild my starter, I am doing the labor of removing and
replacing it myself. My local (auto) mechanic that I have known for a while
said he will rebuild or get me a rebuilt starter, is there any difference
then a major price savings of having my local mechanic do it compared to a
boat marina? Are there any things that you need to do in order to "marine"
the starter?

Thanks for any info.

-Matt