B model distributor question

[barrelnose]

Does the B model distributor/head use the same bolt on the side of the head to keep it held down?
I am trying to remove the distributor but there is no bolt in the side hole and it appears to be a blind hole. The Distributor is rusted badly and that may make it hard to remove,but this either has a broken bolt in the hole(it’s about a 1/4” deep) or it is a blind hole. I touched the bottom of the hole with a 5/16” drill and a appears to be soft like cast iron,not a broken bolt.
Any clues please.