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The fit or wiggle of the 1911 trigger is more to do with the fit of the fit of the bow to the cut.
http://www.brownells.com/.aspx/pid=788/Product/1911_AUTO_TRIGGER_STIRRUP_DIE
To fit a Gold Cup trigger, the frame must be milled or broached to allow the wide trigger pad to fit.
You can use the forming die and bump out the stirrup by striking along the edges in 4 locations on each side to spread the metal just a litle. Then you stone it just a little to let it move easily and without drag, with just 4 points of contact.
A 1/4" steel punch will displace the metal. You can use any steel as an anvil, but will probably need the die to restore the correct shape and uniformity.

http://www.brownells.com/.aspx/pid=788/Product/1911_AUTO_TRIGGER_STIRRUP_DIE
To fit a Gold Cup trigger, the frame must be milled or broached to allow the wide trigger pad to fit.
You can use the forming die and bump out the stirrup by striking along the edges in 4 locations on each side to spread the metal just a litle. Then you stone it just a little to let it move easily and without drag, with just 4 points of contact.
A 1/4" steel punch will displace the metal. You can use any steel as an anvil, but will probably need the die to restore the correct shape and uniformity.