Hi Customer (name blocked for privacy),
I can't find any specific information in my reference texts on any deringer pistol made by Star. Are you certain this is the manufacturer?
If it is like most deringer-type pistols, it engages and releases the hammer by means of a pawl which acts as a sear at the top of the trigger piece. This trigger piece is usually held in place by a metal pin which also serves as the pivot point for the trigger to move backwards. Removing the trigger is probably going to be a fairly 'iffy' process if that's you need to do.
Unless the pistol has been dropped or otherwise damaged, I doubt that shaving the metal will give you what you want and it could potentially make the pistol unreliable or worse, dangerous.
Did the deringer always have a hard trigger pull, or is this a recent development? Right now I'm thinking that something has possibly worked its way up into the 'innards' of the lockwork and is causing the trigger to bind. With tight tolerances, it wouldn't take much: some powder fouling or dirt or even pocket lint could create a tough trigger pull on that type of pistol.
Have you tried cleaning it very thoroughly with a good powder solvent, likes Hoppes No. 9 solvent?
Let me know and if this doesn't work we'll see if we can come up with something else.
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