Now what? I have a copy of Iowegan’s Book of Knowledge. In using his book I was very careful to read it through several times before I would attempt to make any alterations to my gun.
When the gun was new it had a little hitch in the trigger pull in DA. The hitch was in the first part of the trigger pull about when the hammer moved only about ½ an inch. The gun works fine in SA. I polished the hammer dog per instructions, no filing, grinding, sanding or any other major removal of metal. The hitch got worse.
I then polished the top of the trigger, DA cam surface only. Just as with the hammer dog, no filing, grinding, sanding or any other major removal of metal. Now the trigger will move the hammer only about ½ inch and no more. The gun no longer functions in the DA mode. The gun functions fine in SA.

When the gun was new it had a little hitch in the trigger pull in DA. The hitch was in the first part of the trigger pull about when the hammer moved only about ½ an inch. The gun works fine in SA. I polished the hammer dog per instructions, no filing, grinding, sanding or any other major removal of metal. The hitch got worse.
I then polished the top of the trigger, DA cam surface only. Just as with the hammer dog, no filing, grinding, sanding or any other major removal of metal. Now the trigger will move the hammer only about ½ inch and no more. The gun no longer functions in the DA mode. The gun functions fine in SA.