dead spot on starter and sticking bendix
 

Is it true that there is a dead spot on the starter, away from the brushes?
Does the Bendix sometimes stick?
Would a Wack with a rubber hammer loosen the Bendix and manually cranking the engine rotate the starter to a more favorable location?
1933 Model 4 ford

Re: dead spot on starter and sticking bendix
 

Take the cover band off and rotate the commutator with a stick , look at the surface of the commutator where the brushes rub, it should look even all around .
Sometimes the commutator wears in a localized area.
If you see a burned area between a couple segments it could mean the commutator connection to the windings is bad.
If the starter is mechanically jamming the bendix there could be worn teeth on the ring gear or bendix
sometimes whacking the starter jiggles sticking brushes
It’s easier to look if you remove the starter, then you can easily spin the starter shaft by hand and watch the brushes, if they move up- down as you rotate the shaft the commutator is not true and can cause a dead spot

Re: dead spot on starter and sticking bendix
 

A gear drive starter eliminates all of those problems.

Re: dead spot on starter and sticking bendix
 

I had a car many years ago that would not crank at all, and then it would crank just fine. I finally found that the armature when in a certain position would be shorted.

Re: dead spot on starter and sticking bendix
 

don't overlook the solonoid may have corroded contacts put a test light on the starter cable if it lights its the starter most likely the mica needs to be cut

Re: dead spot on starter and sticking bendix
 

There should be no dead spots. Don't bother with the hammer. Remove the starter if the Bendix is sticking and clean and inspect. Don't lube the Bendix with oil it will eventually cause sticking, dry graphite is OK. The rear cover of the starter can be removed and the armature commutator cleaned with scotch bright. Original brushes appear very short in length look for a broken brush spring.
Too much, then have the starter removed and rebuilt tell the rebuilder not to repaint if you want to keep the petina.