[Farmall] M Starter Kit (Brushes and Bushings)

[Kurt Sutheimer]

 My M would not start - I pulled the starter - the bushing on the end is gone - I might as rebuild -
 
1)  Where can I get a kit to rebuild and for how much
2) Are there any good instructions on how to rebuild an M starter
3) I also have an H - are these starters interchangeable?
 
Thanks